Find the 95% confidence interval for estimating the population mean μ If sample mean X = 50, sample size n= 60 and population standard deviation σ is known to be 10.

Answer 1

Hi! I will walk you through how you answer this and all future similar problems using a TI-84 calculator!

Press the following buttons on your calculator in this exact order:

STAT--->TESTS--->ZINTERVAL

After this, plus in the numbers verbatim

Your final answer should be (47.47, 52.53)

Answer 2

95% CI is:

sample mean +/- z-critical * standard deviation/sqrt(sample size)

sample mean is given as 50, standard deviation given as 10 and sample size is given as 60

z-critical for 95% CI is 1.96.