A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x, is found to be 105, and the sample standard deviation, s, is found to be 10. (a) Construct a 90% confidence interval about μµ if the sample size, n, is 15. (b) Construct a 90% confidence interval about µ if the sample size, n, is 19. μ (c) Construct a 95% confidence interval about µ if the sample size, n, is 15. μ (d) Could we have computed the confidence intervals in parts (a)-(c) if the population had not been normally distributed? Click the icon to view the table of areas under the t-distribution. (a) Construct a 90% confidence interval about μ if the sample size, n, is 15. Lower bound:; Upper bound: (Use ascending order. Round to one decimal place as needed.)

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