Margin of Error and Confidence Level

Margin of Error and Confidence Level

11th Grade

18 Qs

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Margin of Error and Confidence Level

Margin of Error and Confidence Level

Assessment

Quiz

Mathematics

11th Grade

Practice Problem

Hard

Created by

Anthony Clark

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18 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

An IQ test was given to a simple random sample of 75 students at a certain college. The sample mean score was 105.2. Scores on this test are known to have a standard deviation of 10. It is desired to construct a 90% confidence interval for the mean IQ scores of the students at the college. Find the critical value.

0.90

1.155

1.645

±1.645

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The larger your confidence interval is, the more sure (higher confidence level) you can be.

True

False

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Complete the equation: 
point estimate +/- _____

standard deviation

margin of error

critical value

confidence level

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What can you do to reduce the margin of error? 

increase the confidence level

decrease the confidence level

increase sample size

decrease sample size

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following is an example of an interval estimate?

point estimate 

critical value

confidence interval

statistic

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the critical value z* for a 99% confidence interval? 

-2.58

1.96

-1.64

2.58

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Construct a 90% confidence interval of a random sample size of 19 cows with a mean of 155.526 and a standard deviation of 19.993. 

(146.54, 164.52)

(147.57, 163.48)

(147.59, 163.46)

(143.69, 167.36)

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