Confidence Intervals and Point Estimation

Which of the following changes to a study would result in a narrower confidence interval?

• increasing the confidence level, increasing the sample size
• decreasing the confidence level, decreasing the sample size
• increasing the confidence level, decreasing the sample size
• decreasing the confidence level, increasing the sample size.

Tags

CCSS.HSS.IC.B.4

What is the point estimator for the interval (-5 , 13)?

• 10

• 9.5

• 9

• -5

Tags

CCSS.HSS.IC.B.4

CCSS.HSS.MD.A.2

CCSS.HSS.MD.A.3

The point estimate is the ______ of the interval.

• middle

• side

• standard deviation

• margin of error

As more samples are added.......

• We get farther from the confidence interval

• Nothing Happens

• We get closer to the confidence interval

As the confidence level decreases, what happens to the interval width?

• Stays the same

• Gets narrower

• Gets Wider

As the confidence level increases, what happens to the interval width?

• Stays the same

• Gets narrower

• Gets Wider

Margin of error decreases when....

Select All that apply

• increase sample size

• decrease confidence level

• decrease sample size

• increase confidence level

True or False: Margin of error only covers chance variation due to random sampling (not other biases)

• True

• False

The Critical value for proportions is what?

• t*

• z*

The Critical value for means is what?

• t*

• z*