Quiz on Confidence Intervals

Quiz on Confidence Intervals

University

10 Qs

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Quiz on Confidence Intervals

Quiz on Confidence Intervals

Assessment

Quiz

Health Sciences

University

Practice Problem

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Created by

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10 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a confidence interval used for in statistics?

To measure the exact value of a population parameter

To estimate a range within which the population parameter lies

To measure the significance of sample results

To find the mean of the sample

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a confidence interval calculation, what does the "margin of error" represent?

The range within which the population parameter lies

The number of errors allowed in a study

The probability that a null hypothesis is true

The difference between the highest and lowest sample value

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

For a 95% confidence interval, what is the commonly used alpha (α) level?

0.05

0.1

0.01

0.025

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If the sample mean is 100, the sample standard deviation is 10, and the sample size is 25, what is the margin of error for a 95% confidence level? (Use Z = 1.96 for 95% confidence)

2

3.92

1.96

5

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How does increasing the sample size affect the margin of error, assuming the confidence level remains the same?

Increases the margin of error

Decreases the margin of error

Has no effect on the margin of error

Changes the confidence level

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following statements is NOT true about a 99% confidence interval compared to a 95% confidence interval?

It has a smaller margin of error

It has a larger margin of error

It requires a smaller sample size

It has a lower alpha value than a 95% confidence interval

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If a researcher wants to reduce the width of a confidence interval without changing the confidence level, which of the following actions can they take?

Increase the alpha level

Decrease the sample size

Increase the sample size

Use a higher Z-score

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