1. Dr. Fictitious Jones conducts a study to test whether losing weight reduces cholesterol levels. He tests 15 people in January. Six months later, after they have all participated in a weight loss program and lost at least 3% of their starting body weight, he measures them again. 

  1. What is your null hypothesis?
  2. What is your research hypothesis?
  3. What test would you run to test your hypothesis?
  4. Run the test at the 5% level of significance. ATTACH YOUR RESULTS!
  5. State whether you accept or reject the null hypothesis

210 215

235 220

190 190

210 200

265 260

195 210

210 195

230 240

190 190

220 180

265 280

195 190

220 180

255 260

205 210

2. You want to know if there is a statistically significant difference between father’s age and miscarriage. You collect data at the Totally Made Up Hospital and find the following:

Miscarriage N Mean Paternal Age Standard Deviation

NO 162. 33.4 2.8

YES 48. 41.1 3.1

  1. What is your null hypothesis?
  2. What is your research hypothesis?
  3. What test would you run to test your hypothesis?
  4. Compute the test at the 5% level of significance. ATTACH YOUR RESULTS!
  5. State whether you accept or reject the null hypothesis

Extra credit: What is the most likely confounding variable in this study and why?

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