Review Margin of Error, Sample Size, SPA 7.1-7.4

Which z-value is used for a 95% confidence interval?

• 1.65

• 1.96

• 2.58

• 2.33

Tags

CCSS.HSS.ID.A.4

Which z-value is used for a 90% confidence interval?

• 1.645

• 1.96

• 2.58

• 2.33

Tags

CCSS.HSS.ID.A.4

A newspaper asks its readers to call in and answer the following question, "Are young adults unprepared for college?" What type of sample is this?

• Convenience Sample

• Random Sample

• Voluntary Response Sample

• Call in sample

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

How do we reduce variability?

• Increase randomness.

• Increase sample size.

• Decrease randomness.

• Decrease sample size.

What does SRS stand for?

• Simple Random Sample

• Survey Random Samples

• Simple Random Survey

• Sample Random Surveys

Tags

CCSS.HSS.IC.B.3

A representative for Macy's walks around the mall interviewing people about their brand perception of Macy's. What kind of sample is this?

• Convenience sample

• random sample

• voluntary response sample

• weighted sample

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

How do we reduce bias?

• Increase variability

• Increase randomness

• Decrease randomness

• Decrease variability

Tags

CCSS.HSS.IC.B.3

The parameter is a number describing the:

• population

• sample

• survey

• percent

Tags

CCSS.HSS.IC.B.3

The statistic is a number describing the:

• population

• sample

• survey

• percent

Tags

CCSS.HSS.IC.B.3

Why do we want our samples to be random?

• To decrease the margin of error

• To increase our confidence

• To decrease variability

• To decrease bias

Tags

CCSS.HSS.IC.B.3