Question

Among various ethnic groups, the standard deviation of heights is known to be approximately three inches. We wish to construct a 95% confidence interval for the mean height of males from a certain country. Forty-six males are surveyed from a particular country. The sample mean is 72 inches. The sample standard deviation is 2.2 inches. Find the following. (Enter exact numbers as integers, fractions, or decimals.) x = σ = n = then, Construct a 95% confidence interval for the population mean height of males of this country. (i) State the confidence interval. (Round your answers to two decimal places.) (ii) Sketch the graph. (a/2, C.L., a/2) (iii) Calculate the error bound. (Round your answer to two decimal places.)

Answer 1