Question

A simple random sample of 60 items from a population with  = 7 resulted in a sample mean of 35.

If required, round your answers to two decimal places.

a. Provide a 90% confidence interval for the population mean.
to

b. Provide a 95% confidence interval for the population mean.
to

c. Provide a 99% confidence interval for the population mean.

Answer 1

Sample size, n= 60   

Population standard deviation , = 7 ( this is not clear in the question as the symbol is missing , but i am assuming it)

Sample mean, = 35

a) 90% confidence interval for the population mean. = ( )

= ( )

= ( )

= (33.5135, 36.4865)

b) 95% confidence interval for the population mean. = ( )

= ( )

= ( )

= (33.2288 , 36.7712)

c) 99% confidence interval for the population mean. = ( )

= ( )

= ( )

= (32.6723, 37.3277)