Answer:
The confidence interval is between 2.23 and 3.53
Explanation:
The confidence interval (C) = 99% = 0.99
α = 1 - C = 1 - 0.99 = 0.01
α/2 = 0.01/2 = 0.005
The z score of α/2 corresponds to the z score of 0.495 (0.5 - 0.005) which is 2.576
The margin of error (E) is given as:
[tex]E=z_{\frac{\alpha}{2} }*\frac{\sigma}{\sqrt{n} }\\\\where\ n=sample\ size,\sigma=standard\ deviation\\\\Given\ that\ \sigma=1.59,n=40,z_{\frac{\alpha}{2} }=2.576\ hence: \\\\E=2.576*\frac{1.59}{\sqrt{40} } =0.65[/tex]
The confidence interval = mean ± margin of error = 2.88 ± 0.65 = (2.23, 3.53)
The confidence interval is between 2.23 and 3.53
