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Department store accepts three types of credit cards, MasterCard, Visa, and their own store card. Charges are normally distributed. A random sample of 18 credit card purchases included 6 MasterCard, 7 Visa, and 5 store charges. The total sum of squares calculated was 7,114, and the sum of squares within groups (SSE) was 3776.0333. At the .05 significance level, can we conclude there is a difference in the mean amounts charged per purchase on the three cards?
Where should the warranty limits be set so that only 10 percent of the HDTVs need repairs at the manufacturer's expense?
A random sample of 1440 current job applicants results in 61 failures (based loosely on data from the American Management Association).
What is sampling with replacement, and why it is used?
Suppose we wish to test the hypothesis H0: = µ2 vs. H1: = µ≠2 We find a two sided p-value of .03 and a 95% CI for µ of (1.5, 4.0) Are these two results possibly compatible? Why or why not?
If we fit the least-squares line to the 12 data points (one for each month) we obtain the following results from a software package. Notice that temperature is taken as the explanatory variable and crawling age as the response.
Entities arrive at single-server queuing system at average of 4 per hour and server can service average of 5 per hour. Mean in the queue is?
Listed below are the commissions earned ($000) last year by the sales representatives at the Furniture Patch, Inc.
Assume we have a population of scores with mean (mu) of 200 and standard deviation (sigma) of 10. Assume that the distribution is normal. Provide answers to the following questions:
Compute the standard error of the mean O(funny o with line) line over x, for sample sizes of 50, 100, 15o, and 200. What can you say about the size of the standard error of the mean as the sample size is increased?
Test whether the mean weight is greater than 16 ounces with P-value approach.
A supervisor has noticed that sales for all departments world wide has been averaging $12,000 a month for a number of years. For the last 18 review periods the average sales figure has dropped to $11,500 with a standard deviation of $4,000. Manage..
If Weight 1 is the weight (in pounds) of a random sample of five men who were accepted as models, and Weight 2 is the weight (in pounds) of a random sample of five men who were rejected as models, which of the following is the appropriate inferenc..
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