SOLUTION: The number of motorcycles sold annually by salespeople is normally distributed with a standard deviation of 15. A random sample of 300 salespeople taken and the mean number of moto

Question 1192242: The number of motorcycles sold annually by salespeople is normally distributed with a standard deviation of 15. A random sample of 300 salespeople taken and the mean number of motorcycles sold annually was found to be 75. Find the 99% confidence interval estimate of the population mean.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
99% half-interval is z*sqrt(p*(1-p)/n)
=2.576*sqrt(.25*.75/300)
=0.0644
the interval is mean+/- half-interval
(0.1856, 0.3144)
RELATED QUESTIONS
X is a normally distributed random variable with a mean of 22 and a standard deviation of (answered by stanbon)

A random variable X is normally distributed with a mean of 85 and a standard deviation of (answered by ewatrrr)

According to a leasing firm's reports, the mean number of miles driven annually in its... (answered by ikleyn)

Assume that the random variable X is normally distributed with a mean of 70 and a... (answered by rothauserc)

Given that x is a normally distributed random variable with a mean of 28 and a standard... (answered by stanbon)

Given that x is a normally distributed random variable with a mean of 28 and a standard... (answered by Fombitz)

Given that the random variable X is normally distributed with a mean of 80 and a standard (answered by lynnlo)

IQ scores are normally distributed with a mean score of 100 and a standard deviation of... (answered by ewatrrr)

a bottle shop sell o average 2500 bottles per day with standard deviation of 300 bottles... (answered by Boreal)