Probability and Statistics Pretest

Probability and Statistics Pretest

11th Grade

10 Qs

quiz-placeholder

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Probability and Statistics Pretest

Probability and Statistics Pretest

Assessment

Quiz

Mathematics

11th Grade

Practice Problem

Hard

Created by

Anthony Clark

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

John Paul conducted a poll survey in which 320 out of 600 randomly selected voters indicated their preference for a certain candidate. He uses 95% confidence interval. What is the confidence interval estimate of the population proportion who prefer the candidate?

50% < p < 56%

48% < p < 58%

44% < p < 62%

42% < p < 64%

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In a 99% confidence level with margin of error 0.20 and sample proportion 0.45, what is the sample size to be used?

41

42

43

44

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A politician engaged the services of a private opinion pollster to determine the sample size needed among his constituents to interview about their perceptions on the freedom of information bill. Previous polls revealed that approximately 62% are in favor of the bill. The politician adopted 95% level of confidence and off the value of the population by at most 0.02. What should be the sample size?

1603

1604

2262

2263

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

10

1

0.1

0.01

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Using the z table, what is the critical value when the level of significance a = 0.10 and it is a left-tailed test?

0.25

0.26

1.28

1.29

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Smaller p-values indicate more evidence in support of:

the null hypothesis

the alternative hypothesis

the quality of the researcher

further testing

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is a random variable?

A random variable is a variable that only takes on values from a specific set of outcomes.

A random variable is a constant that represents a specific event in a process.

A random variable is a fixed number that does not change.

A random variable is a variable that takes on numerical values determined by the outcomes of a random process.

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