Quiz 2 1332

Assume that a distribution has a mean of 25 and a standard deviation of 5. What percentage of the values in the distribution do we expect to fall between 20 and 25​?

Use the​ 68-95-99.7 rule.

• 68%

• 25%

• 95%

• 34%

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CCSS.HSS.ID.A.4

Which is a normal distribution graph?

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• 
• 
• 

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CCSS.HSS.ID.A.4

If the mean is 78 and the standard deviation is 4, and you score an 84, what is your percentile? _ Percentile

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CCSS.HSS.ID.A.4

The data set 5, 6, 7, 8, 9, 9, 9, 10, 12, 14, 17, 17, 18, 19, 19 represents the number of hours spent on the Internet in a week by students in a mathematics class. Which box-and-whisker plot represents the data?

• 1

• 2

• 3

• 4

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CCSS.6.SP.B.4

CCSS.HSS.ID.A.1

Find the standard deviation for the given data. Round to one more decimal place than the original data.

​3, 5,​ 6, 6,​ 9, 1

• 5.4

• 2.8

• 2.5

• 7.6

Determine whether the following study is an observational study or an experiment. If the study is an​ experiment, identify the control and treatment​ groups, and discuss whether​ single- or​ double-blinding is necessary. If the study is​ observational, state whether it is a​ case-control study, and if​ so, identify the cases and controls.

In a study of the effects of magnets on back​ pain, some participants were treated with magnets while others were given nonmagnetic objects with a similar appearance. The magnets did not appear to be effective in treating back pain.

• Observational​ study; not​ case-control

• Observational​ study; case​ control; the cases are the patients that received​ magnets, the controls are the patients that received placebos

• 
  ​Experiment; the treatment group is patients that used the magnets and the control group is patients that received the​ placebo; double blind

• ​Experiment; the treatment group is all patients and the control group is patients that received the​ magnets; single blind

A tax auditor selects every 1000th income tax return that is received. Identify which of

these types of sampling is used.

• Random

• Cluster

• Systematic

• Stratified

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CCSS.HSS.IC.B.3

A musician wanted to see what people who bought his last album thought about the songs.

Which choice best represents a sample?

• Every person who bought the album.

• A selection of people who didn't want to buy the album.

• 250 girls who bought the album.

• A selection of 3,294 people who bought the album.

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

The lunch program at Saxe is being revised to align with new nutritional standards. They send a survey out to every student in the school to learn about school lunches. Does this represent the population or a sample?

• Population

• Sample

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1