Practice Test

Question 1

How might the graph be misleading?

Revolt · Accepted Answer

A: The scale on the  y -axis overemphasizes the difference in salaries between different experience levels.

Question 2

The distribution of the values of a population is shown in the graph, and a simple random sample is drawn from the population. Based on this information alone, can the sample be used to make inferences about the population?

Revolt · Accepted Answer

C: Yes, because the population values appear to be normally distributed.

Question 3

A utility company hires pollsters to knock on random doors in different parts of town to survey residents about the cost of their electric bill. Would this study be biased? Why or why not?

Revolt · Accepted Answer

D: Yes, it is biased. Some of the residents who are surveyed may not want to respond to someone who knocks at their door.

Question 4

Weston completed a hypothesis test and found that he could not reject the null hypothesis. Which of the following is a valid reason for his conclusion?

Revolt · Accepted Answer

D: The  z -statistic lies outside the critical region.

Question 5

A company has an opportunity to bid on three contracts. Determine which would be the best investment given the information in the table. Probability of Profit and Loss by Contract Contract Profit, Probability of Profit Probability to Break Even Loss, Probability of Loss Southeast 45 dollars comma 000 , 50 percent 30 percent 6 dollars comma 000 , 20 percent Southwest 60 dollars comma 000 , 35 percent 40 percent 10 dollars comma 000 , 25 percent California 112 dollars comma 000 , 20 percent 40 percent 40 dollars comma 000 , 40 percent

Revolt · Accepted Answer

D: Southeast

Question 6

A normal distribution of data has a mean of 90 and a standard deviation of 18 What is the approximate z -score for the value 64 ?

Revolt · Accepted Answer

A: negative 1 point 4; C: negative 3 point 6

Question 7

Opal is collecting data on water levels in different parts of town. She notices that her sample data has a low-value outlier. Which statement must be true?

Revolt · Accepted Answer

B: Removing the outlier will decrease the spread of the graph of the data set.

Question 8

Laila guesses on all 20 questions of a multiple-choice test. Each question has 4 answer choices. What is the probability of a success and a failure for this experiment?

Revolt · Accepted Answer

C: cap p times success is equal to 1 fourth ;  cap p times failure is equal to 3 fourths

Question 9

The president of the math club is conducting a survey to see where the twelfth-grade class wants to go on their field trip. Instead of asking the whole class, she surveys only the twelfth-grade members of the math club. She records their choices and plans to present the results to the school principal. What type of sampling did she use?

Revolt · Accepted Answer

D: convenience sampling

Question 10

When finding the margin of error for the mean of a normally distributed population from a sample, what is alpha , assuming a confidence level of 74 percent ?

Revolt · Accepted Answer

C: 0 point 1 3

Practice Test Answers

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