Question

Write the corresponding letter of the distribution used to conduct the test to answer the question or to find the probability requested in the blank to the left of the given information. You will only use each letter once.

1. Student’s T
2. Standard Normal
3. Chi-Square
4. Binomial
5. Poisson

________________ Researchers want to study the effect of a new drug on reducing cholesterol levels. A sample of 500 individuals with high cholesterol were randomly assigned to one of two groups (placebo, drug). The distribution of the change in cholesterol levels within each group are approximately normally distributed. The researchers want to test to see if the mean change in cholesterol level differs between the placebo group and drug group.

Answer 1

Researchers want to study the effect of a new drug on reducing cholesterol levels. A sample of 500 individuals with high cholesterol were randomly assigned to one of two groups (placebo, drug). The distribution of the change in cholesterol levels within each group are approximately normally distributed. The researchers want to test to see if the mean change in cholesterol level differs between the placebo group and drug group: b. Standard Normal

(since sample size under each group is very large i.e. 250 for each group, so we use large sample test)