# Question

Researchers conducted an experiment to test the effects of alcohol. The errors were recorded in a test of visual and motor skills for a treatment group of 22 people who drank ethanol and another group of 22 people given a placebo. The errors for the treatment group have a standard deviation of 2.20, and the errors for the placebo group have a standard deviation of 0.72. Use a 0.05 significance level to test the claim that the treatment group has errors that vary more than the errors of the placebo group.

Assume that both samples are independent simple random samples from populations having normal distributions.

Assume that both samples are independent simple random samples from populations having normal distributions.

## Answer to relevant Questions

If we use the body temperatures from 8 A.M. on Day 2 as listed in Data Set 3 in Appendix B, we get the statistics given in the accompanying table. Use these data with a 0.05 significance level to test the claim that men have ...Listed below are heights (cm) of randomly selected females and males taken from Data Set 1 in Appendix B. Use a 0.05 significance level to test the claim that females and males have heights with the same amount of ...Construct a confidence interval suitable for testing the claim from Exercise 1. What feature of the resulting confidence interval leads to the same conclusion from Exercise 1? Use the sample data from Exercise 9 to test the claim that the two populations have LDL levels with the same standard deviation. Use a 0.05 significance level. The baseline characteristics of different treatment groups are ...Another (clearly inferior) statistics textbook includes an exercise in which students are given the mean income for each of the 50 states. The students are then asked to compute the mean of those 50 values. Is the result the ...Post your question

0