A recent issue of a national magazine reported that in a national public opinion survey conducted among 2,000 individuals, 56% were in favor of gun control, 40% opposed gun control, and 4% had no opinion on the subject. a. What is the sample in this survey? b. Based on the sample, what percentage of the population would you think is in favor of gun control? c. Based on the sample, what percentage of the population would you think have no opinion on the subject?

Use the following results from a test for marijuana use, which is provided by a certain drug testing company. Among 140 subjects with positive test results, there are 24 false positive results. Among 152 negative results, there are 3 false negative results. Complete parts (a) through (c). (Hint: Construct a table.) a. How many subjects were included in the study? The total number of subjects in the study was 292. b. How many subjects did not use marijuana? A total of 173 subjects did not use marijuana. c. What is the probability that a randomly selected subject did not use marijuana? The probability that a randomly selected subject did not use marijuana is ☐ (Do not round until the final answer. Then round to three decimal places as needed.)

A researcher wants to know if hair color is associated with intelligence. To this end, the researcherrecruits 58 blonds and 59 brunettes. The researcher then assesses each person’s intelligence and comesup with the following results. In the blond group, there are 30 with below-average intelligence, 15 withaverage intelligence, and 13 with above-average intelligence. In the brunette group, there are 25 withbelow-average intelligence, 17 with average intelligence, and 17 with above-average intelligence. How many total participants were involved in the hair color and intelligence study? How many participants were below-average in intelligence in the hair color and intelligence study?

Each month, the census bureau mails survey forms to 250,000 households asking questions about the people living in the household and about such things as motor vehicles and housing costs. Telephone calls are made to households that don't return the form. In one month, responses were obtained from 240,000 of the households contacted. The sample is:   a. the 240,000 households that responded.   b. the 250,000 households initially contacted.   c. the 10,000 households that did not respond.   d. all U.S. households.