Estimate the value of the population proportion
The Nile Superstore is conducting a survey of consumer preferences for a new wireless, e-book reader. A sample of 160 people reveals that 120 would buy the new reader. Estimate the value of the population proportion.
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A population is estimated to have a standard deviation of 25. We want to estimate the population mean within 2, with a 95 percent level of confidence. How large a sample is required?
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A university wants to determine the proportion of students who use a cash card to pay at the university food service. Out of 100 students surveyed, 65 students use a cash card. Estimate the value of the population proportion.
The mean driving time is 35 minutes with a standard deviation is 10 minutes. What is the 98 percent confidence interval for the population mean?
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