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AP Stats Random Variables Practice

Authored by Anthony Clark

Mathematics

12th Grade

CCSS covered

AP Stats Random Variables Practice
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12 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A simple random sample of 25 world-ranked tennis players provides the following statistics: Number of hours practiced per day: mean = 7.3, standard deviation = 1.2 Yearly winnings: mean = $1,820,000, standard deviation = $310,000 Correlation = 0.23 Based on this data, what is the LSRL that predicts winnings from number of hours practiced?

Tags

CCSS.8.EE.C.8C

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following statements about the correlation (r) are true?

I only

II only

III only

I, II, and III

All are false.

Answer explanation

None of the statements are true.

I. r = 0 means there's no linear relationship, not no relationship.

II. r is never measured as a percent.

III. correlation doesn't prove causation.

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A study is conducted relating AP Statistics exam scores to the total number of study hours for the AP Statistics class put in by students during the academic year, and the correlation is found to be 0.6. Which of the following are true statements?

III only

I and II

I and III

II and III

I, II, and III

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following are true statements about the correlation coefficient?

I and II

I and III

II and III

I, II, and III

I or II

Answer explanation

Correlation is unitless, so changing measurements or changing which variable is x and which is y will not change correlation.

Correlation is greatly affected by outliers.

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following statements about residuals are true?

I and II

I and III

II and III

I, II, and III

None are true.

Answer explanation

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Name the sampling method:

Assign each car in a dealership a number and then use a random-number table to select the cars to be inspected.

systematic

simple random sample

convenience

Self - selected (volunteer)

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

The boxplots above summarize two data sets, A and B.

Which of the following must be true?

 

I. Set A contains more data than Set B.

II. The box of Set A contains more data than the box of Set B.

III. The data in Set A have a larger range than the data in Set B.

I only

III only

I and II only

II and III only

I, II, and III

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