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A credit card company surveys its customers to determine the number of times they use the card each month. There are 5,500 customers and 2,756 indicate that they use the card at least twice each month. Find the population proportion, as well as the mean and standard deviation of the sampling distribution for samples of size n=70 customers. Round all answers to 3 decimal places.
Of a random sample of 600 trucks at a bridge, 114 had bad signal lights. Construct a 95 percent confidence interval for the percentage of trucks that had bad signal lights.
in a certain town 70 people support the construction of a new ballpark. if 5 people are randomly selected what is the
What kinds of plots are useful in data screening? What can you do if your data do not meet the assumptions of your statistic?
The William G. Harding School of Public Affairs would like to evaluate its affirmative action program for students. After extended discussion, the faulty
Describe what this cor relation indicates about the association between the fastest speed driven and picking a number between 1 and 10.
A legislative aide is doing research on the duration of calls initiated on car cellular phones. A preliminary study showed that the standard deviation of these calls is 1.6 minutes.
It is desirable for the process nonconformance to be within 1.5%. If the acceptable level of type I error is 0.05, find the modified control limits for the process mean.
Suppose the sample mean is x‾ = 4.014. Should the process be stopped?- Suppose the sample mean is x‾ = 3.979. Should the process be stopped?
1. If the forecasted demand is 750 tons, what should the university do? 2. Find the break-even point.
describe how you would use a random number table to get a random sample of 50 people who had listed phone numbers in a
After collecting data for 30 days, you plan to construct the control charts.
15 are ink jet printers. if a group of 10 printers is chosen at random from the store, find the mean and variance of the number of ink jet printers.
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