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Twelve different video games showing substance use were observed and the duration times of game play (in seconds) are listed below (based on data from "Content and Ratings of Teen-Rated Video Games," by Haninger and Thompson, Journal of the American Medical Association, Vol. 291, No. 7). The design of the study justifies the assumption that the sample can be treated as a simple random sample. 4049 3884 3859 4027 4318 4813 4657 4033 5004 4823 4334 4317
a. Use the sample data to construct a 95% confidence interval estimate of ?, the mean duration of game play.
b. Use the sample data to construct a 99% confidence interval estimate of ?, the standard deviation of the duration times of game play.
Standard deviation of 6.9 centimeters.assuming that the heights are recorded to the nearest half-cm, how many of these students would you expect to have heights less than 160.0 centimeters.
If 49 applicants are randomly chosen, what is the probability that they will have a rating between 230 and 260? Round z scores to two decimal places.
answer each question with a minimum of 40 words per question1the poisson distribution can be a reasonable approximation
Find the sample proportion and the large-sample margin of error for 95% confidence. Explain in simple terms the meaning of the 95%.
Probability of fair market is 0.4, and probability of bad market is 0.2, and he wants to maximize his long-run average return. Create the decision table for this problem.
the barrons big money poll asked 131 investment managers across the united states about their short-term investment
Does the variability in output appear to differ at the two experience levels? Test the hypotheses at the .05 significance level.
What probability distribution does n1 alone have? Specify the values of the sample size index and parameter for that distribution
let x be random variable with the following probability
the marketing research team of an investment corporation is trying to determine its target market for the promotion of
question 1 a persons blood glucose level and diabetes are closely related. let x be a random variable measured in
Normal distribution with a mean of 131 pounds and a standard deviation of 5.9574 pounds. What percent of the students would you expect to weigh at least 145 pounds?
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