7. Sampling Distributions & Confidence Intervals: Mean - Parte 1 di 2!
7. Sampling Distributions & Confidence Intervals: Mean / Confidence Intervals for Population Mean / Problema 15
Problema 15
A wellness researcher is studying the average daily screen time of adults. In a previous analysis, a random sample of adults showed a mean daily screen time of hours with a standard deviation of hours. The researcher claims that the population mean daily screen time is hours. Assuming the population of screen times are normally distributed, determine whether the calculated -value falls between and at the confidence level.