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The standard deviation of the population is 70 books per professor. An anthropologist wishes to find the 99% confidence interval for the mean number of books each professor has. How many professors must the anthropologist sample to obtain an average accurate to within 14 books per professor?
A survey is planned to determine the mean annual family medical expenses of employees of a large company. The management of the company wishes to be 95% confident that the sample mean is correct to within plus-or-minus $50 of the population mean.
Suppose that a random sample of fifteen recently sold houses in a certain city has a mean sales price of $290000 , with a standard deviation of $15,000.
A study conducted by the research department of a pharmaceutical company claims that the annual spending (per person) for prescription drugs for allergy relief,is greater than or equal to the annual spending (per person) for non-prescription aller..
What is the probability that the team wins tonight and that there will be a large crowd at tomorrow's game?
Generate a 95% confidence interval for the true mean total cholesterol levels in children.
If the mean number of serious accidents per year in a large factory (where the number of employees remains constant) is five, find the probability that in the current year there will be:
A bank's loan officer rates applicants for credit. The ratings can be described by a Normal model with a mean of 200 and a standard deviation of 50.
Create a histogram for the following data of the number of miles from residence to place of employment for 30 randomly selected residents of Middletown County.
At the 5% level of significance, can we infer that branch A has a significantly higher proportion of satisfied customers than branch B?
What is your approach? Also, what about the other components of hypothesis testing such as confidence level?
The manufacturer of the X-15 steel-belted radial truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60,000 miles. The standard deviation of the mileage is 5,000 miles.
A suburban hotel derives its gross income from its hotel and restaurant operations. The owners are interested in the relationship between the number of rooms occupied on a nightly basis and the revenue per day in the restaurant.
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