4.13 Statistics Review 3 (A2)

Statistics Review

A crash course...

Open Ended

What is a survey?

Open Ended

What is an observational study?

Open Ended

What is an experiment?

Multiple Choice

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.

• Observational study

• Experimental study

Open Ended

Give an example of a population and a sample group that could be taken from that population.

For example, a population would be players in the NFL and a sample would be Bills players.

Multiple Choice

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.

• Population

• Sample

Multiple Choice

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

• Population

• Sample

Multiple Choice

What is the standard deviation for the data given:

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

• 6.89

• 10.1

• 7.26

• 9

Multiple Choice

All of the below sets have the same mean.
Set 1-Standard Deviation=3.1
Set 2-Standard Deviation=4.9
Set 3-Standard Deviation=1.7
Set 4-Standard Deviation=3.2
Which set of data probably has the points closest to the mean?

• 1
• 2
• 3
• 4

*** We can use "2" for a 95% confidence level! ***

Multiple Choice

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

• $77.78

• $4.31

• $188.78

• $494.97

Multiple Choice

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?

• 77% - 80%

• 74% - 77%

• 74% - 80%

• 50 million high schoolers - 120 million

Open Ended

A study finds that 96.2% of Mr. Sheehan's Algebra 2 students are sick of working on this assignment. If the margin of error for a 99% confidence interval is 1.2%, write a confidence statement about this study.