UsA state highway patrol official wishes to estimate the number of drivers that exceed the speed limit traveling a certain road. How large a sample is needed in order to be 90 % confident that the sample proportion will not differ from the true proportion by more than 3%e the centra

The amounts of time employess of a telecommunication company have worked for the company are normally distributed with a mean of 5.4 years and a standard deviation of 2.1 years. Random samples of size 12 are drawn from the population and the mean of each sample is determined.Use the central limit therom to find the mean and standard error of the mean of the sampling distribution.