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A microwave manufacturing company has just switched to a new automated production system. Unfortunately, the new machinery has been frequently failing and requiring repairs and service. The company has been able to provide its customers with a completion time of 6 days or less. To analyze whether the completion time has increased, the production manager took a sample of 36 jobs and found that the sample mean completion time was 6.5 days with a sample standard deviation of 1.5 days. At a significance level of .10, test whether the completion time has increased.
Using the appropriate statistical procedure on the SPSS, test the between group means for a significant difference.
Label and describeeach step of the hypothesis testing procedure, and be sure to specify whether this is a one-tailed or two-tailed test.
Assume that the bricks used are randomly chosen from a population of bricks whose mean length is 10 inches and whose standard deviation is 1/32 inch.
Why might the assumption of independence be violated? (b) Why might a driver be tempted not to use a seat belt "just on this trip"?
Team Sports, Inc. sells sporting goods to high schools and colleges via a nationally distributed catalog. Management at Team Sports estimates they will sell 2,000 Wilson Model A2000 catcher's mitts next year.
A data set comprises of set of numerical values. Which, if any, of the following statements could be right? Point to whether given statement could apply to data set consisting of 1,000 values which are all different.
Which of the following is NOT true regarding the normal probability distribution.
In an experiment in which a die was rolled 188 times it was counted up how many times each face came up. The results are as follows:
Four of calculators are selected to be sent to local high school. How many selections can be made using original shipment?
A sample of 50 provided a sample mean of 14.15. The population standard deviation is 3.
For the most recent year available, the mean annual cost to attend a private university in the United States was $20,182. Assume the distribution of annual costs follows the normal probability distribution and the standard deviation is $4,400.
Use the study to estimate the risk of an air bag fatality on a child seated on the front passenger seat.
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