2024 Unit 9 Test Review - Statistical Studies

A researcher wanted to gather data on public opinion on climate change. He created a questionnaire about beliefs on climate change, and potential solutions. He conducted his research through telephone interviews with residents of a county. What type of statistical study was used by the researcher?

• Experiment

• Survey

• Retrospective Studies

• Observational Study

The effects of joint pain-relieving medication were researched in a statistical study.

What describes the placebo effect experienced by the control group?

• It is occurring only when the control group is informed about receiving a placebo

• It indicates that beliefs and expectations contribute to perceived improvement even though no active treatment is provided

• It indicates that the new medication is not effective

• It is experienced by the control and treatment groups

Find the mean, median, mode and standard deviation for the data set: (2, 3, 4, 5, 8, 8, 12)

• 5

• Median

• 8

• Mode

• 6

• Mean

• 3.25

• Standard Deviation

Which boxplot displays the 5-number summary listed:   4, 5, 10, 14, 16

• 
• 
• 
• 

In the graph, the standard deviation of the distribution is 2.

What percentage of data points is included in the interval from 4 to 8 on the normal distribution graph?

• 60%

• 50.3%

• 95%

• 68%

The distribution graphs below show specific characteristics. Match the graphs with their characteristics.

• Left-Skewed Distribution

• 
• Right-Skewed Distribution

• 
• Normal Distribution with a mean of 1.6

• 
• Normal Distribution with a mean of 2

• 

The average capybara weighs 115 ± 20 lb.

What is the z-score for a capybara that weighs 85 lb?

Tags

CCSS.HSS.ID.A.4