solve

Enter the values of the sample size, the point estimate for the population mean, the population standard deviation, and the critical value you need for your 90% confidence interval. (Choose the correct critical value from the table of critical values provided.) When you are done, select "Compute". Sample size: 5 X 45 Standard error: 0.41 Point estimate: 0.407 Population standard deviation: Margin of error: Confidence level Critical value 2.73 0.67 99% 20.005 = 2.576 Critical value: 1.645 90% confidence interval: 95% 20.025 = 1.960 0.407 +0.67 Compute 90% 20.050 = 1.645 (b) Based on your sample, enter the lower and upper limits to graph the 90% confidence interval for the population mean of the battery lifetimes for all phones of the manufacturer's latest model