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A retail credit association wants to test the hypothesis that for all department stores in a certain city, the average size of a delinquent charge account is $108. To be specific, it wants to test the hypothesis against the alternative that the average is not $108 at a level of significance of .05. What can they conclude if 16 delinquent accounts (selected at random) have a mean of $114 and a standard deviation of $8.50?
What is the direction of the test? (TWO-TAILED or UPPER-TAILED or LOWER-TAILED)
a researcher wanted to compare food ratings at restaurants located in the city with those located in the suburbs. she
1. other things being equal as the sample size increases the standard error of a statistica. increasesb.
Find the probability that the sales for next month was 15,000 or larger.
Assume you are in charge of a production line which allows for no more than 1% defectives in order to be in compliance. A random sample of 500 is tested and 4 defective items are found. Find the probability of getting exactly 4 defectives out of..
Distribution showing the advertising expenditures for 60 manufacturing companies located in the Southwest. Estimate the mean and the standard deviation of advertising expense.
Red cards. You shuffle a deck of cards and then start turning them over one at a time. The first one is red. So is the second. And the third.
The data is given below. At 0.05 significance level, test the research hypothesis that μ, the average ratio, is greater than 675. Test the hypothesis using two approaches: the rejection region approach, and the p-value approach.
In addition, is it a problem that the number of men and women in the sample is different? Why or why not? Note: This is a two sample test for proportion, please use the following guidelines
a sample of 85 male professors at a major four-year university produced a mean annual pay of 75600 and a standard
Multiply matrix a by matrix b matrix a: row 1 = [0 1 2] row 2 = [-1 4 .5] row 3 = [1 3 0]
Determine the average number of farms per state from these data. The mean computedfrom the original ungrouped data was 41,796 and the standard deviation.
city records indicate that the average age of the houses on the west side of town is 43 years with standard deviation
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