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A pollster for the Public Policy Institute of California explains how the Institute selects a sample of California adults ("It's About Quality, Not Quantity," San Luis Obispo Tribune, January 21, 2000): That is done by using computer-generated random residential telephone numbers with all California prefixes, and when there are no answers, calling back repeatedly to the original numbers selected to avoid a bias against hard-to-reach people. Once a call is completed, a second random selection is made by asking for the adult in the household who had the most recent birthday. It is as important to randomize who you speak to in the household as it is to randomize the household you select. If you didn't, you'd primarily get women and older people. Comment on this approach to selecting a sample. How does the sampling procedure attempt to minimize certain types of bias? Are there sources of bias that may still be a concern?
A simple random sample of 280 men included 71 who smoke, and a simple random sample of 340 women included 68 who smoke. Use a 0.05 significance level to test the claim that the proportion of men who smoke is greater than the proportion of women wh..
Assume that in a political science class, the teacher gives a midterm exam and a final exam Assume that the association between midtem & final scores is linear.
Assume that the statistic was based on legitimate, well-conducted research.- What additional information would you want about the risk before deciding whether or not to quit drinking coffee?
Which distribution should be used to create 80% confidence interval?
a starting lineup in basketball consists of two guards two forwards and a center. a certain college team has on its
a student at a large university is conducting a study of political feelings of students at his university. the student
A powder diet is tested on 49 people, and a liquid diet is tested on 36 different people. Of interest is whether the liquid diet yields a higher mean weight.
1. Assuming the binomial distribution applies with a sample size of n 15, find a. the probability of 5 or more successes if the probability of a success is 0.30 b. the probability of fewer than 4 successes if the probability of a success is 0.75
using a 5 significance level test the claim that there is a gender differenceamong 2200 randomly selected males 72 wear
If a small business is randomly selected, determine the following probabilities: The small business lists both the tax burden and regulations as a challenge.
Assume that the distribution is normal. Based on empirical rule how many students scored between 51 and 79.
(a) Set up a 99% confidence interval estimate of the true population average amount of paint included in a five-litre can. (Use the z-table.) (b) Based on the results of (a), do you think that the store owner has a right to complain to the manufact..
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