Six measurements were made of the magnesium ion concentration (in parts per million, or ppm) in a city’s municipal water supply, with the following results. It is reasonable to assume that the...

Six measurements were made of the magnesium ion concentration (in parts per million, or ppm) in a city’s municipal water supply, with the following results. It is reasonable to assume that the population is approximately normal. 143, 157, 165, 154, 143, 163. Construct 99% confidence interval for the mean magnesium ion concentration. Interpret the results.