Question

Probability and Statistics

Could you please solve the following questions with specifying the answers

A. A survey of 900 gun-owners who frequent a popular shooting range in Texas had a nearly 100% response rate. If only 18% of the respondents thought more laws on gun control should be enacted, the conclusion that less than 20% of people in the region support more gun laws would certainly be dubious due to which of the following?

a. large standard deviation of samples of size 900       b. nonresponse from the sample

c. sampling bias of respondents       d. small sample size

B. Scores on a test for 8^th graders range from 0 to 500. In a SRS of 400 students, the mean score is 335 and the standard deviation is 70. The standard deviation of the sampling distribution of x̅₄₀₀ is what?

1. 70/335        b. 400/70       c. 70/20         d. 335/20

C. The weights of a sample of 400 2-year-olds in Kentucky yields x̅₄₀₀ is 21.2 pounds with a standard deviation of σ = 3 pounds. What is a 95% confidence interval for the weight of all two-year-olds in Kentucky?
a. 18.2-21.5 pounds     b. 15.2-27.2 pounds        c. 21.185-22.015 pounds     d. 20.9-21.5 pounds

Answer 1