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A scrap metal dealer claims that the mean of his cash sales is "no more than $80," but an Internal Revenue Service agent believes the dealer is untruthful.
Observing a sample of 20 cash customers, the agent finds the mean purchase to be $91, with a standard deviation of $21. Assuming the population is approximately normally distributed, and using the 0.05 level of significance, is the agent's suspicion confirmed?
For a sample of engineers, the mean salary is $95,000 with a standard deviation of $30,000. The median value is $80,000. What is the relative shape of the distribution and coefficient of skewness?
Find the mean length. Find the median length. Find the range of the lengths. Find the mean deviation of the lengths. Finds the standard deviation of the lengths
in a poll of 600 randomly selected subjects 240 answered yes when asked if they planned to vote in a state election.
The sum of squares associated with the artist (factor B) is 2,230. The sum of squares for interactions is 804. The sum of squares for error is 8,262. Construct the ANOVA table, carry out the hypothesis tests, and state your conclusions.
The U.S. forest service is considering additional restrictions on the number of vehicles allowed to enter Yellowstone National Park. To assess public reaction, the service asks a random sample of 150 visitors if they favor the proposal.
Based on surveys conducted in 1989 and 1999, a researcher compared the proportion of high school age females interested in a career in science in 1989 with the proportion in 1999. He concluded that the proportions were not significantly different ..
using the table of critical --values of the t distribution find the range of values for the p-value for testing a claim
State the null hypothesis and the alternate hypothesis. State the decision regarding the null hypothesis.
a bagel shop wants to estimate their daily demand for their popular poppy seed bagel. the shop owner determined that
What are the odds against drawing a card from an ordinary deck of cards and getting a spade?
What statistical tests can perform to compare two groups asked the same question, when the question has a yes/no answer and the sample groups are different.
(a) Construct a 99% confidence interval for μC-μP, the true difference in average typing speed between the caffeine and placebo groups. Assume that the true variances are equal. (b) Construct a 99% confidence interval for μC-μP, the true differenc..
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