# Question: The mean weight of all 20 year old women is 128

The mean weight of all 20-year old women is 128 pounds (http://www.kidsgrowth.com). A random sample of 40 vegetarian women who are 20 years old showed a sample mean of 122 pounds with a standard deviation of 15 pounds. The women's measurements were independent of each other.

a. Determine whether the mean weight for 20-year old vegetarian women is significantly less than 128, using a significance level of 0.05.

b. Now suppose the sample consists of 100 vegetarian women who are 20 years old, and repeat the test.

c. Explain what causes the difference between the p-values for parts a and b.

a. Determine whether the mean weight for 20-year old vegetarian women is significantly less than 128, using a significance level of 0.05.

b. Now suppose the sample consists of 100 vegetarian women who are 20 years old, and repeat the test.

c. Explain what causes the difference between the p-values for parts a and b.

## Relevant Questions

Thirty GPAs from a randomly selected sample of statistics students at Oxnard College are available at this text's website. Assume that the population distribution is approximately Normal. The technician in charge of records ...A biologist is interested in studying the effects that applying insecticide to a fruit farm has on the local bat population. She collects 23 bats from a grove of fruit trees where the insecticide is used and finds the mean ...Calls Answers.com claims that the mean length of all cell phone conversations in the United States is 3.25 minutes (3 minutes and 15 seconds). Assume that this is correct, and also assume that the standard deviation is 4.2 ...The prices of a random sample of comparable (matched) textbooks from two schools were recorded. We are comparing the prices at OC (Oxnard Community College) and CSUN (California State University at Northridge). Assume that ...Compare the weights of backpacks of men and women. (Source: StatCrunch: Backpack. Owner: Wikipeterson)Post your question