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A random sample of 13 DVD movies had a mean length of 119.4 minutes, with a standard deviation of 73.8 minutes. Find the lower bound of the 90% confidence interval for the true mean length of all Hollywood movies. Assume movie lengths to be approximately normally distributed.
Employees of a local university have been classified according to gender and job type. The following table provides data about the employees.
Suppose we compare two population means, μ 1 - μ 2 . In each case, indicate how μ 1 relates to μ 2 :
Describe the plot. Examine the display in the Scatterplot tab carefully.- Is the relationship that we observed for Alabama and Alaska true for all states? Give reasons for your answer.
COLLEGE MAJORS The Office of Admissions and Records of a large western university released the accompanying information concerning the contemplated majors.
according to runzheimer international the average cost of a domestic trip for business travelers in the financial
Find a number k such that the chance that the number of hands is between 500 000 - I and 500,000 + k is approximately 0.96.
The following data are the number of pages in 40 books on a shelf. Construct a box plot using a graphing calculator, and state the interquartile range.
Construct a payoff table for Mountain Ski's decision problem of how many pairs of skis to order. What is the best decision from an expected value basis?
n article by Julia Moskin in the New York Times reports on the use of cheap wine in cooking.- Find the mean, median, and modes of these data. Based on these data alone, do you think cheap wine works?
A consumer advocate researches the length of life between two brands of refrigerators, Brand A and Brand B.
In a two-tailed hypothesis testing at significance level α of 0.05, the test statistic is calculated as 2. If P(X >2) = 0.03, then we have sufficient evidence to reject the null hypothesis.
what is the formula of t-quantile distribution needed to calculate an exact 90 confidence interval for the
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