Margin of Error

A study was commissioned to find the average water bill of a particular town.

The confidence interval created was between $44-$56.

What was the average of the sample?

• $44

• $50

• $52

• $54

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.4

A study by the department of education in a certain state found that there was a mean SAT score of 534 with a margin of error of 20.

Which score(s) would fall outside the confidence interval?

• 505

• 530

• 550

• 558

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.4

CCSS.HSS.ID.A.4

A study by the department of education in a certain state found that there was a mean SAT score of 534 with a margin of error of 20.

Create a confidence interval for the true mean.

• (534, 554)

• (514, 534)

• (514, 554)

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.4

Determine whether the action would increase or decrease the margin of error:

Increase the sample size

• Margin of error increases

• Margin of error decreases

Tags

CCSS.HSS.IC.B.4

Determine whether the action would increase or decrease the margin of error:

Increase the confidence level from 95% to 99.7%

• Margin of error increases

• Margin of error decreases

Tags

CCSS.HSS.IC.B.4

Determine whether the action would increase or decrease the margin of error:

Decrease the confidence level from 95% to 68%

• Margin of error increases

• Margin of error decreases

Tags

CCSS.HSS.IC.B.4

Determine whether the action would increase or decrease the margin of error:

Decrease the sample size

• Margin of error increases

• Margin of error decreases

Tags

CCSS.HSS.IC.B.4

A random sample of 40 bags of Doritos was obtained.

The mean weight was 15.5 oz with a standard deviation of 0.2 oz.

Find the standard deviation of the sample.

Tags

CCSS.HSS.ID.A.4

A random sample of 40 bags of Doritos was obtained.

The mean weight was 15.5 oz with a standard deviation of 0.2 oz.

At a 95% confidence level, find the margin of error of the sample.

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.4

A survey was given to a random sample of 120 voters in the United States to ask about their preference for a presidential candidate. Of those surveyed, 66 respondents said that they preferred Candidate A.

What percentage of people preferred Candidate A.

• 35%

• 65%

• 66%

• 95%

Tags

CCSS.HSS.IC.B.4

CCSS.HSS.ID.B.5