A survey of an urban university showed that 900 of 1,460 students sampled supported a fee increase to fund improvements to the student recreation center. Using the 99% level of confidence, what is the confidence interval for the proportion of students supporting the fee increase?

A)[0.596, 0.636]

B) [0.583, 0.649]

C) [0.592, 0.639]

D) [0.576, 0.654]

A local retail company wants to estimate the mean amount spent by customers. Their store's budget limits the number of surveys to 250. What is their maximum error of the estimated mean amount spent for a 99% level of confidence and an estimated standard deviation of $17.00?

A) $8.00

B) $17.00

C) 8%

D) $2.77

A university surveyed recent graduates of the English department for their starting salaries. Four hundred and twenty graduates returned the survey. The average salary was $25,200, with a standard deviation of $2,500. What is the best point estimate of the population mean?

A) $25,200

B) $420

C) $2,500

D) $62.7

A survey of an urban university showed that 975 of 1,400 students sampled supported a fee increase to fund improvements to the student recreation center. Using the 95% level of confidence, what is the confidence interval for the proportion of students supporting the fee increase?

A)[0.619, 0.773]

B) [0.664, 0.728]

C) [0.672, 0.721]

D) [0.676, 0.716]

The mean weight of trucks traveling on a particular section of I-475 is not known. A state highway inspector needs an estimate of the population mean. He selects and weighs a random sample of 49 trucks and finds the mean weight is 16.2 tons. The population standard deviation is 4.2 tons. What is the 95% confidence interval for the population mean?

A) 13.5 and 18.1

B) 16.4 and 18.6

C)15.0 and 17.4

D) 10.3 and 20.5