SPSS: Statistics 04 Homework Solution

SPSS: Statistics 04 Homework

Part 1 – Consolidating Concepts (5 marks)

1. Describe the situations where you would use a one sample t test versus a one sample z test? (1 mark)
2. Describe the main difference between dependent and independent t tests? Provide your own original example of when you would use a dependent t test vs. independent t test. Note: do not copy the examples from the modules. (2 marks)
3. Describe how parametric tests differ from nonparametric tests? (1 mark)
4. Describe the properties of a chi square distribution. (1 mark)

Part 2 – Application Using Statistical Software (15 marks)

Research suggests that individuals with diabetes are at an increased risk for developing chronic kidney disease (CKD). To explore this relationship in a lab-based setting, rats were treated to induce diabetes, and followed over a period of 8 weeks to determine what proportion developed chronic kidney disease, and a number of biological markers were collected.

Answer the questions using the M04_CKD_Data file in OnQ.

Note: the data for this scenario was adapted from a real experimental study conducted in Dr.

Adams’ lab.

Problem #1: Does the proportion of rats diagnosed with chronic kidney disease vary between diabetic rats and healthy controls? (5 marks)

1. State your hypothesis statements and significance level.
2. Describe the statistics analysis you chose and why.
3. Describe the assumptions of this statistical test. Describe how you tested the assumptions and provide any relevant statistical output/values to support your conclusions about whether the assumptions were met.
4. Use SPSS to calculate a test statistic and p-value. Report your findings.
5. State whether you would reject or fail to reject the null hypothesis based on your findings and provide 1 summary statement of your findings.

Problem #2: Does chronic kidney disease stage (0 – 5) differ between diabetic rats and healthy controls? (5 marks)

1. State your hypothesis statements and significance level.
2. Describe the statistics analysis you chose and why.
3. Describe the assumptions of this statistical test. Describe how you tested the assumptions and provide any relevant statistical output/values to support your conclusions about whether the assumptions were met.
4. Use SPSS to calculate a test statistic and p-value. Report your findings.
5. State whether you would reject or fail to reject the null hypothesis based on your findings and provide 1 summary statement of your findings.

Problem #3: Does kidney function as measured by estimated glomerular filtration rate (eGFR) differ between diabetic rats and healthy controls? (5 marks)

1. State your hypothesis statements and significance level.
2. Describe the statisticics analysis you chose and why.
3. Describe the assumptions of this statistical test. Describe how you tested the assumptions and provide any relevant statistical output/values to support your conclusions about whether the assumptions were met.
4. Use SPSS to calculate a test statistic and p-value. Report your findings.
5. State whether you would reject or fail to reject the null hypothesis based on your findings and provide 1 summary statement of your findings.