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Complete Answers to EXERCISE 19 Understanding Pearson Chi-Square
$10.00Questions
1. According to the relevant study results section of the Darling-Fisher et al. (2014) study, what categories are reported to be statistically significant?
2. What level of measurement is appropriate for calculating the χ2 statistic? Give two examples from Table 2 of demographic variables measured at the level appropriate for χ2.
3. What is the χ2 for U.S. practice region? Is the χ2 value statistically significant? Provide a rationale for your answer.
4. What is the df for provider type? Provide a rationale for why the df for provider type presented in Table 2 is correct.
2005. Is there a statistically significant difference for practice setting between the Rapid Assessment for Adolescent Preventive Services (RAAPS) users and nonusers? Provide a rationale for your answer.
6. State the null hypothesis for provider age in years for RAAPS users and RAAPS nonusers.
7. Should the null hypothesis for provider age in years developed for Question 6 be accepted or rejected? Provide a rationale for your answer.
8. Describe at least one clinical advantage and one clinical challenge of using RAAPS as described by Darling-Fisher et al. (2014).
9. How many null hypotheses are rejected in the Darling-Fisher et al. (2014) study for the results presented in Table 2? Provide a rationale for your answer.
10. A statistically significant difference is present between RAAPS users and RAAPS nonusers for U.S. practice region, χ2 = 29.68. Does the χ2 result provide the location of the difference? Provide a rationale for your answer.
Complete Answers to EXERCISE 14 Understanding Simple Linear Regression
$10.00Questions
1. According to the study narrative and Figure 1 in the Flannigan et al. (2014) study, does the APLS UK formula under- or overestimate the weight of children younger than 1 year of age? Provide a rationale for your answer.
2. Using the values a = 3.161 and b = 0.502 with the novel formula in Figure 1, what is the predicted weight in kilograms (kg) for a child at 9 months of age? Show your calculations.
3. Using the values a = 3.161 and b = 0.502 with the novel formula in Figure 1, what is the predicted weight in kilograms for a child at 2 months of age? Show your calculations.
4. In Figure 2, the formula for calculating y (weight in kg) is Weight in kg = (0.176 × Age in months) + 7.241. Identify the y intercept and the slope in this formula.
1505. Using the values a = 7.241 and b = 0.176 with the novel formula in Figure 2, what is the predicted weight in kilograms for a child 3 years of age? Show your calculations.
6. Using the values a = 7.241 and b = 0.176 with the novel formula in Figure 2, what is the predicted weight in kilograms for a child 5 years of age? Show your calculations.
7. In Figure 3, some of the actual mean weights represented by blue line with squares are above the dotted straight line for the novel formula, but others are below the straight line. Is this an expected finding? Provide a rationale for your answer.
8. In Figure 3, the novel formula is (weight in kilograms = (0.331 × Age in months) − 6.868. What is the predicted weight in kilograms for a child 10 years old? Show your calculations.
9. Was the sample size of this study adequate for conducting simple linear regression? Provide a rationale for your answer.
10. Describe one potential clinical advantage and one potential clinical problem with using the three novel formulas presented in Figures 1, 2, and 3 in a PICU setting.
Complete Answers to Exercise 33 Questions
$12.50Questions
1. Do the data meet criteria for homogeneity of variance? Provide a rationale for your answer.
2. If calculating by hand, draw the frequency distribution of the dependent variable, hours worked at a job. What is the shape of the distribution? If using SPSS, what is the result of the Shapiro-Wilk test of normality for the dependent variable?
3. What are the means for three groups’ hours worked on a job?
4. What are the F value and the group and error df for this set of data?
3925. Is the F significant at α = 0.05? Specify how you arrived at your answer.
6. If using SPSS, what is the exact likelihood of obtaining an F value at least as extreme as or as close to the one that was actually observed, assuming that the null hypothesis is true?
7. Which group worked the most weekly job hours post-treatment? Provide a rationale for your answer.
8. Write your interpretation of the results as you would in an APA-formatted journal.
9. Is there a difference in your final interpretation when comparing the results of the LSD post hoc test versus Tukey HSD test? Provide a rationale for your answer.
10. If the researcher decided to combine the two Treatment as Usual groups to represent an overall “Control” group, then there would be two groups to compare: Supported Employment versus Control. What would be the appropriate statistic to address the difference in hours worked between the two groups? Provide a rationale for your answer.
Complete Answers to Exercise 18 Questions
$12.50Questions
1. Mayland et al. (2014) do not provide the degrees of freedom (df) in their study. Use the degrees of freedom formulas provided at the beginning of this exercise to calculate the group df and the error df.
2. What is the F value and p value for spiritual need—patient? What do these results mean?
3. What is the post hoc result for facilities for the hospital with LCP vs. the hospital without LCP (see Table 2)? Is this result statistically significant? In your opinion, is this an expected finding?
4. What are the assumptions for use of ANOVA?
1905. What variable on Table 3 has the result F = 10.6, p < 0.0001? What does the result mean?
6. ANOVA was used for analysis by Mayland et al. (2014). Would t-tests have also been appropriate? Provide a rationale for your answer.
7. What type of post hoc analysis was performed? Is the post hoc analysis performed more or less conservative than the Scheffé test?
8. State the null hypothesis for care for the three study groups (see Table 2). Should the null hypothesis be accepted or rejected? Provide a rationale for your answer.
9. What are the post hoc results for care? Which results are statistically significant? What do the results mean?
10. In your opinion, do the study findings presented in Tables 2 and 3 have implications for end of life care? Provide a rationale for your answer.
Complete Answers to Exercise 18 and Exercise 33 Questions
$27.50Complete Answers to Exercise 18 Questions
1. Mayland et al. (2014) do not provide the degrees of freedom (df) in their study. Use the degrees of freedom formulas provided at the beginning of this exercise to calculate the group df and the error df.
2. What is the F value and p value for spiritual need—patient? What do these results mean?
3. What is the post hoc result for facilities for the hospital with LCP vs. the hospital without LCP (see Table 2)? Is this result statistically significant? In your opinion, is this an expected finding?
4. What are the assumptions for use of ANOVA?
1905. What variable on Table 3 has the result F = 10.6, p < 0.0001? What does the result mean?
6. ANOVA was used for analysis by Mayland et al. (2014). Would t-tests have also been appropriate? Provide a rationale for your answer.
7. What type of post hoc analysis was performed? Is the post hoc analysis performed more or less conservative than the Scheffé test?
8. State the null hypothesis for care for the three study groups (see Table 2). Should the null hypothesis be accepted or rejected? Provide a rationale for your answer.
9. What are the post hoc results for care? Which results are statistically significant? What do the results mean?
10. In your opinion, do the study findings presented in Tables 2 and 3 have implications for end of life care? Provide a rationale for your answer.
Complete Answers to Exercise 33 Questions
1. Do the data meet criteria for homogeneity of variance? Provide a rationale for your answer.
2. If calculating by hand, draw the frequency distribution of the dependent variable, hours worked at a job. What is the shape of the distribution? If using SPSS, what is the result of the Shapiro-Wilk test of normality for the dependent variable?
3. What are the means for three groups’ hours worked on a job?
4. What are the F value and the group and error df for this set of data?
3925. Is the F significant at α = 0.05? Specify how you arrived at your answer.
6. If using SPSS, what is the exact likelihood of obtaining an F value at least as extreme as or as close to the one that was actually observed, assuming that the null hypothesis is true?
7. Which group worked the most weekly job hours post-treatment? Provide a rationale for your answer.
8. Write your interpretation of the results as you would in an APA-formatted journal.
9. Is there a difference in your final interpretation when comparing the results of the LSD post hoc test versus Tukey HSD test? Provide a rationale for your answer.
10. If the researcher decided to combine the two Treatment as Usual groups to represent an overall “Control” group, then there would be two groups to compare: Supported Employment versus Control. What would be the appropriate statistic to address the difference in hours worked between the two groups? Provide a rationale for your answer.
Complete Answers to Exercise 32 Questions
$12.50EXERCISE 32 Questions to be Graded
Follow your instructor’s directions to submit your answers to the following questions for grading. Your instructor may ask you to write your answers below and submit them as a hard copy for grading. Alternatively, your instructor may ask you to use the space below for notes and submit your answers online at http://evolve.elsevier.com/Grove/statistics/ under “Questions to Be Graded.”1. Do the example data meet the assumptions for the paired samples t-test? Provide a rationale for your answer.
2. If calculating by hand, draw the frequency distributions of the two variables. What are the shapes of the distributions? If using SPSS, what are the results of the Shapiro-Wilk tests of normality for the two variables?
3. What are the means for the baseline and posttreatment affective distress scores, respectively?
4. What is the paired samples t-test value?
3765. Is the t-test significant at α = 0.05? Specify how you arrived at your answer.
6. If using SPSS, what is the exact likelihood of obtaining a t-test value at least as extreme as or as close to the one that was actually observed, assuming that the null hypothesis is true?
7. On average, did the affective distress scores improve or deteriorate over time? Provide a rationale for your answer.
8. Write your interpretation of the results as you would in an APA-formatted journal.
9. What do the results indicate regarding the impact of the rehabilitation on emotional distress levels?
10. What are the weaknesses of the design in this example?
Complete Answers to Exercise 31 Questions
$15.00EXERCISE 31 Questions to Be Graded
Follow your instructor’s directions to submit your answers to the following questions for grading. Your instructor may ask you to write your answers below and submit them as a hard copy for grading. Alternatively, your instructor may ask you to use the space below for notes and submit your answers online at http://evolve.elsevier.com/Grove/statistics/ under “Questions to Be Graded.”1. Do the example data meet the assumptions for the independent samples t-test? Provide a rationale for your answer.
2. If calculating by hand, draw the frequency distributions of the dependent variable, wages earned. What is the shape of the distribution? If using SPSS, what is the result of the Shapiro-Wilk test of normality for the dependent variable?
3. What are the means for two group’s wages earned?
4. What is the independent samples t-test value?
3625. Is the t-test significant at a = 0.05? Specify how you arrived at your answer.
6. If using SPSS, what is the exact likelihood of obtaining a t-test value at least as extreme or as close to the one that was actually observed, assuming that the null hypothesis is true?
7. Which group earned the most money post-treatment?
8. Write your interpretation of the results as you would in an APA-formatted journal.
9. What do the results indicate regarding the impact of the supported employment vocational rehabilitation on wages earned?
10. Was the sample size adequate to detect significant differences between the two groups in this example? Provide a rationale for your answer.
Complete Answers to Exercise 17 Questions
$15.00EXERCISE 17 Questions to Be Graded
Follow your instructor’s directions to submit your answers to the following questions for grading. Your instructor may ask you to write your answers below and submit them as a hard copy for grading. Alternatively, your instructor may ask you to use the space below for notes and submit your answers online at http://evolve.elsevier.com/Grove/Statistics/ under “Questions to Be Graded.”1. What are the assumptions for conducting a paired or dependent samples t-test in a study? Which of these assumptions do you think were met by the Lindseth et al. (2014) study?
2. In the introduction, Lindseth et al. (2014) described a “2-week washout between diets.” What does this mean? Why is this important?
3. What is the paired t-test value for mood (irritability) between the participants’ consumption of high- versus low-aspartame diets? Is this result statistically significant? Provide a rationale for your answer.
4. State the null hypothesis for mood (irritability) that was tested in this study. Was this hypothesis accepted or rejected? Provide a rationale for your answer.
1785. Which t value in Table 2 represents the greatest relative or standardized difference between the high- and low-aspartame diets? Is this t value statistically significant? Provide a rationale for your answer.
6. Discuss why the larger t values are more likely to be statistically significant.
7. Discuss the meaning of the results regarding depression for this study. What is the clinical importance of this result?
8. What is the smallest, paired t-test value in Table 2? Why do you think the smaller t values are not statistically significant?
9. Discuss the clinical importance of these study results about the consumption of aspartame. Document your answer with a relevant source.
10. Are these study findings related to the consumption of high- and low-aspartame diets ready for implementation in practice? Provide a rationale for your answer.
Complete Answers to Exercise 16 Questions
$15.00EXERCISE 16 Questions to Be Graded
Follow your instructor’s directions to submit your answers to the following questions for grading. Your instructor may ask you to write your answers below and submit them as a hard copy for grading. Alternatively, your instructor may ask you to use the space below for notes and submit your answers online at http://evolve.elsevier.com/Grove/Statistics/ under “Questions to Be Graded.”1. What do degrees of freedom (df) mean? Canbulat et al. (2015) did not provide the dfs in their study. Why is it important to know the df for a t ratio? Using the df formula, calculate the df for this study.
2. What are the means and standard deviations (SDs) for age for the Buzzy intervention and control groups? What statistical analysis is conducted to determine the difference in means for age for the two groups? Was this an appropriate analysis technique? Provide a rationale for your answer.
3. What are the t value and p value for age? What do these results mean?
4. What are the assumptions for conducting the independent samples t-test?
5. Are the groups in this study independent or dependent? Provide a rationale for your answer.
6. What is the null hypothesis for procedural self-reported pain measured with the Wong Baker Faces Scale (WBFS) for the two groups? Was this null hypothesis accepted or rejected in this study? Provide a rationale for your answer.
7. Should a Bonferroni procedure be conducted in this study? Provide a rationale for your answer.
8. What variable has a result of t = −6.135, p = 0.000? What does the result mean?
9. In your opinion, is it an expected or unexpected finding that both t values on Table 2 were found to be statistically significant. Provide a rationale for your answer.
10. Describe one potential clinical benefit for pediatric patients to receive the Buzzy intervention that combined cold and vibration during IV insertion.
