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The mean annual income of certified welders is normally distributed with a mean of $50,000 and a population standard deviation of $2,000. The ship building association wishes to find out whether their welders earn more or less than $50,000 annually. The alternate hypothesis is that the mean is not $50,000. If the level of significance is 0.10, what is the decision rule?
A. Do not reject the null hypothesis if computed z lies between -1.645 and +1.645; otherwise, reject it.
B. Do not reject the null hypothesis if computed z is greater than 1.645; otherwise, reject it.
C. Do not reject the null hypothesis if computed z lies between -1.960 and +1.960; otherwise, reject it.
D. Reject the null hypothesis if computed z is below -1.960; otherwise, reject it.
Chicken Delight claims that 84 percent of its orders are delivered within 10 minutes of the time the order is placed. A sample of 70 orders revealed that 55 were delivered within the promised time.
The mean time between failures is found to be 322.4 hours for a sample group. assuming that s= 45.0 hours, find the 99% confidence interval for the mean time between failures for all such radios.
If there is an outage, there is a .05 probability that the resulting losses will be very large, approximately $ 80 million in lost earnings. Also, it is estimated that there is a .95 probability of only slight losses of around $ 1 million. What is..
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Salary data for a sample of 50 universities were obtained. We are curious about the relationship between mean salaries for assistant professors.
The study compared the number of Hm-2 gene mutations in each group. The data table is below.
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