Confidence Interval Large Means

Confidence Interval Large Means

12th Grade

11 Qs

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Confidence Interval Large Means

Confidence Interval Large Means

Assessment

Quiz

Mathematics

12th Grade

Practice Problem

Hard

Created by

Anthony Clark

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11 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Suppose that a confidence interval for hours worked by students was computed to be (8.82, 10.78). Which of these is a valid interpretation of this confidence interval?

There is a 95% probability that the average number of hours worked by all students is between 8.82 and 10.78 hours.

There is a 95% probability that a randomly selected student worked between 8.82 and 10.78 hours.

We are 95% confident that the population average number of hours worked by all students is between 8.82 and 10.78 hours.

We are 95% confident that the average number of hours worked by the students in our sample is between 8.82 and 10.78 hours.

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

What do we use to estimate unknown parameters?

Hypothesis Test

Confidence Interval

Trig Identity

Guess and check

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

You have an SRS of 23 observations from large population. The distribution of sample values is roughly symmetric with no outliers. What critical value would you use to obtain a 98% confidence interval for the mean of the population?

2.177

2.183

2.326

2.500

2.508

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A quality control inspector will measure the salt content (in milligrams) in a random sample of bags of potato chips from an hour of production. Which of the following would result in the smallest margin of error in estimating the mean salt content σ ?

90% confidence; n = 25 

90% confidence; n = 50 

95% confidence; n =25 

95% confidence; n =50 

n=100 at any confidence level 

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

What interval should be used?

2 Sample t interval for means

Paired t interval

Paired t test

1 proportion z interval

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

What interval should be used?

2 Proportion z interval

1 Proportion t interval

1 Proportion z interval

Chi Square for Goodness of Fit

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