In this video I do a quick summary review of the AP Statistics Course Chapter 7 Sampling Distributions. I cover Population Parameters and Sample Statistics, Sampling Distributions, and the Central Limit Theorem by going over the problem below.
The principal of a large high school is concerned about the number of absences for students at his school. To investigate, he prints a list showing the number of absences during the last month for each of the 2500 students at the school. For this population of students, the distribution of absences last month is skewed to the right with a mean of m = 1.1 and a standard deviation of s = 1.4.
Suppose that a random sample of 50 students is selected from the list printed by the principal and the sample mean number of absences is calculated.
(a) What is the shape of the sampling distribution of the sample mean? Explain.
(b) What are the mean and standard deviation of the sampling distribution of the sample mean?
(c) What is the probability that the mean number of absences in a random sample of 50 students is less than 1?
(d) Because the population distribution is skewed, the principal is considering using the median number of absences last month instead of the mean number of absences to summarize the distribution. Describe how the principal could use a simulation to estimate the standard deviation of the sampling distribution of the sample median for samples of size 50.