a. A statistics practitioner randomly sampled 10 observations and found x = 103 and s = 17. Is there sufficient evidence at the 10% significance level to conclude that the population mean is less than...

a. A statistics practitioner randomly sampled 10 observations and found x = 103 and s = 17. Is there sufficient evidence at the 10% significance level to conclude that the population mean is less than 110? b. Repeat part (a) assuming that you know that the population standard deviation is σ = 17. c. Explain why the conclusions produced in parts (a) and (b) differ.