4.13 Statistics Review 3 (A2)

State whether the situation represents an experimental study or an observational study.

Suppose you are trying to determine how much RTA is used by Tri-C students. Find 100 Tri-C students and randomly split them into two groups. One group uses RTA for transportation and the other group uses other means of transportation.

Identify the following data set:

.... a survey from Gwinnett County Public Schools, required that all of the teachers fill out the survey about what they thought about Meadow creek High School during that year.

Identify the following data set:

....a manager of a movie theater was asking customers at the concession stand how they would rate the theater’s staff

What is the standard deviation for the data given:

5, 10, 7, 12, 0, 20, 15, 22, 8, 2

For a class project, a student in a statistics class surveys the monthly rent for 32 unfurnished one-bedroom apartments in Boston and finds the mean monthly rent to be $1400 with a standard deviation of $220.

Find the margin of error for the sample mean. (assuming 95% confidence) Round to the nearest hundredth

A recent survey found that 77% of high schoolers use their phones more than 4 hours a day on average. The margin of error was 3%. What is the interval for which we could expect to find the truth of the population?