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The Gallup Poll asked a sample of 178 U.S. adults, "Did you, yourself, happen to attend church or synagogue in the last 7 days?" Of the respondents, 75 said "Yes" Suppose that Gallup's sample was an SRS.
a) Give a 95% confidence interval for the proportion of all U.S. adults who attended church.b) Use "Plus Four" method to have a more accurate 95% confidence interval.c) Is this proportion of sample different from the national proportion 0.5 0 p =Given α = 0.05.
Compute the difference in traffic counts on the 6th and the 13th. Can you conclude that people tend to stay home more on Friday the 13th?
A health care analyst would like to know that if the duration of a given eye surgical procedure has a normal distribution with a mean of 240 minutes and a standard deviation of 40 minutes
What nonparameiric test can be used to distinguish total heart weight of males with left-heart disease with that of normal males? Write and Implement test and report a p-value.
Find out the probability
A researcher believes that if she uses a different text the students will score differently on the standardized test but she doesn't know what the difference is. The test had a mean of 110 and a σ of 12.
Use the study to estimate the risk of an air bag fatality on a child seated on the front passenger seat.
What's the probability that among three randomly selected high school students
(a) State the hypothesis for a right-tailed test. (b) Obtain a test statistic and p-value assuming equal variances. Interpret these results. (c) Is the difference in mean scores large enough to be important?
Assume Nick doesn't know how his received he suppose that all three states of nature are equally likely to occur. If Nick uses the equally likely criterion illustrate what decision would he make.
If you must estimate the population mean within 10 days, how many outside salespeople should you sample? Use the 90 percent confidence level.
The management of White Industries is considering a new method of assembling its golf cart. The present method requires 42.3 minutes, on the average, to assemble a cart.
Determine marginal probability distributions of X and Y . Compute conditional probability P ( Y = 2 | X = 1)
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