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A 95% confidence interval for the mean reading achievement score for a population of third-grade students is (44.2, 54.2). Suppose you compute a 99% confidence interval using the same information. Which of the following statements is correct?

The intervals have the same width.

Which best describes confidence interval?

The range of values that defines a population parameter with a certain degree of confidence.

The range of values that defines a sample statistic with a certain degree of confidence.

The probability that a population parameter is the same as the point estimate.

The range of values that always includes the population parameter.

Confidence Intervals Practice

Authored by Katrina Boggus

Mathematics

12th Grade

CCSS covered

Used 4+ times

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26 questions

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FILL IN THE BLANK QUESTION

1 min • 1 pt

Suppose a confidence interval was given to be (5 , 13)
What is the point estimate for the interval ?

Tags

CCSS.HSS.IC.B.4

FILL IN THE BLANK QUESTION

1 min • 1 pt

Suppose a confidence interval was given to be (5 , 13)
What is the margin of error for the interval ?

Tags

CCSS.HSS.IC.B.4

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the margin of error for the interval (6.8, 12.9)?

9.85

3.05

3.50

6.8

Tags

CCSS.HSS.IC.B.4

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which of the following actions would produce a confidence interval with a smaller width?

Using a higher confidence level

Using a lower confidence level

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

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

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A 90% confidence interval for the average salary of all CEOs in the electronics industry was constructed using the results of a random survey of 45 CEOs. The interval was ($139,048, $154,144). Which is the correct interpretation of the interval?

We are 90% confident that the mean salary of all CEOs in the electronics industry falls in the interval $139,048 to $154,144.

90% of all CEOs in the electronics industry have salaries that fall between $139,048 to $154,144

Tags

CCSS.HSS.IC.B.4

FILL IN THE BLANK QUESTION

1 min • 1 pt

What is the critical value used for a 98% confidence interval for a proportion?

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Confidence Intervals Practice

Suppose a confidence interval was given to be (5 , 13)
What is the point estimate for the interval ?

Suppose a confidence interval was given to be (5 , 13)
What is the margin of error for the interval ?

What is the margin of error for the interval (6.8, 12.9)?

Which of the following actions would produce a confidence interval with a smaller width?

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

A 90% confidence interval for the average salary of all CEOs in the electronics industry was constructed using the results of a random survey of 45 CEOs. The interval was ($139,048, $154,144). Which is the correct interpretation of the interval?

What is the critical value used for a 98% confidence interval for a proportion?

I randomly select 25 students’ Math SAT scores and find the mean to be 600. I know the standard deviation of the population is 50. Find a 95% Confidence Interval.
Identify the Variables

An IQ test was given to a simple random sample of 40 students at a certain college. The sample mean score was 105.2 with a standard deviation of 10. Researchers want to construct a 90% confidence interval.
Identify the Variables

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Mathematics

Confidence Intervals Practice

Suppose a confidence interval was given to be (5 , 13)What is the point estimate for the interval ?

Suppose a confidence interval was given to be (5 , 13)What is the margin of error for the interval ?

What is the margin of error for the interval (6.8, 12.9)?

Which of the following actions would produce a confidence interval with a smaller width?

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

A 90% confidence interval for the average salary of all CEOs in the electronics industry was constructed using the results of a random survey of 45 CEOs. The interval was ($139,048, $154,144). Which is the correct interpretation of the interval?

What is the critical value used for a 98% confidence interval for a proportion?

I randomly select 25 students’ Math SAT scores and find the mean to be 600. I know the standard deviation of the population is 50. Find a 95% Confidence Interval.Identify the Variables

An IQ test was given to a simple random sample of 40 students at a certain college. The sample mean score was 105.2 with a standard deviation of 10. Researchers want to construct a 90% confidence interval. Identify the Variables

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Mathematics

Suppose a confidence interval was given to be (5 , 13)
What is the point estimate for the interval ?

Suppose a confidence interval was given to be (5 , 13)
What is the margin of error for the interval ?

I randomly select 25 students’ Math SAT scores and find the mean to be 600. I know the standard deviation of the population is 50. Find a 95% Confidence Interval.
Identify the Variables

An IQ test was given to a simple random sample of 40 students at a certain college. The sample mean score was 105.2 with a standard deviation of 10. Researchers want to construct a 90% confidence interval.
Identify the Variables