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Let x be the random variable representing amount of sleep each adult in New York City got last night. Let a sampling distribution of sample means x. As sample size becomes increasingly large, determine value will mean μ x of x distribution approach? What value will standard deviation σ x of sampling distribution approach? How do two x distributions for sample size n = 50 and n = 100 compare?
In a survey of 8000 woman, 5431 say they change their nail polish once a week. Construct a 99% confidence interval for the population proportion of woman who change their nail polish once a week. A 99% confidence interval for the population is??
Which approach is most preferred and why? Optimistic, conservative, or minimax regret. Also, is establishing the most appropriate approach before analysising the problem important for the decision maker?
Suppose we select a sample of 40 tires and use a simulator to determine the tread life. What is the likelihood of finding that the sample mean is between 59,050 and 60,950?
Delivery Format The General Social Survey asks, "About how often did you have sex in the past 12 months?" About 47% of respondents indicated they had sex at least once a week.
Calculate the expected number of days it takes to get the order and standard deviation.
Construct a 95% confidence interval for the proportion of votes that Jefferson will receive, and make a conclusion about Jefferson winning election.
A hypothesis will test that two population means are equal. A sample of 10 with a standard deviation of 3 is selected from the first population and a sample of 15 with a standard deviation of 8 from the second population.
Determining probability when guessing answers. Test comprise of multiple- choice questions each having 4 possible answers (a, b, c, d) one of which is right. Suppose that you guess answers to six such questions.
A motor transport company has 50 similar buses. The management suspects that its control of these vehicles is inadequate. What suggestions could you make for investigating vehicle use, and tightening managerial control over the company?
For a random sample of 12 days at the Downtown location, the mean number sold was 78.80 and the standard deviation was 14.25. At the .05 significance level, is there a difference in the mean number of hamburgers sold at the two locations?
Bob Nale is the owner of Nale's Quick Fill. Bob would like to estimate the mean number of gallons of gasoline sold to his customers.
Given the data set body-weight.sav, use SPSS to calculate the 90%, 95% and 99% confidence intervals for the mean of the variable weight.
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