AP Statistic Confidence Interval for Means

AP Statistic Confidence Interval for Means

12th Grade

13 Qs

quiz-placeholder

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AP Statistic Confidence Interval for Means

AP Statistic Confidence Interval for Means

Assessment

Quiz

Mathematics

12th Grade

Practice Problem

Hard

Created by

Anthony Clark

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13 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 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 to $154,144. Give the interpretation of the interval.

90% of the sampled CEOs have salaries that fell in the interval $139,048 to $154,144

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

There is a 90% chance that CEOs in the electronics industry have salaries that fall between $139,048 to $154,144

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

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Complete the equation: 
point estimate +/- _____

standard deviation

margin of error

critical value

confidence level

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the format for interpreting a confidence interval? 

The interval from ___ to ___ captures the true mean in context.

C% of samples of the same size taken from the same population will capture the parameter in question

There is convincing evidence that C% gives the interval (___, ___) capturing the parameter in question.

We are C% confident that the interval from ___ to ___ captures the [parameter in context].

4.

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

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Given the interval (1.2, 1.8), what is the point estimate and the margin of error? 

1.5, 0.6

1.5, 0.3

1.2, 0.3

1.2, 0.6

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What critical value t* is used in constructing a 99% confidence interval based on n = 12 randomly selected observations. 

3.106

3.055

2.58

1.96

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Find the critical value, z*, for 91% confidence.

70

34

0.18

-34

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