Applied Probability and Statistics (FZO1 C955) (Applied-Probability-and-Statistics) Free Practice Test

Question 1

Variance of Poisson # = 5 = ?

A. 4

B. 0

C. 5

D. 1

Correct Answer: C

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Question 2

There are 20 men in a room whose heights are reflected in inches as 68, 70, 73, 67, 71, 68, 76, 70, 73, 66, 68,
69, 71, 74, 73, 72, 65, 60, 70, and 78 inches respectively.
What is the median of these data?

A. 70

B. 73

C. 68

D. 71

Correct Answer: A

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Question 3

Confidence interval = sample mean ± ?

A. Variance × n

B. SD only

C. Median

D. Critical value × SE

Correct Answer: D

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Question 4

Uniform distribution 0-10: P(X < 4) = ?

A. 0.6

B. 0.25

C. 0.4

D. 0.5

Correct Answer: C

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Question 5

The table shows the results of a survey of favorite movie genres.

What is the probability of selecting an action and then a comedy respondent if the selection is replaced?

A. 75%

B. 12.5%

C. 10.5%

D. 68%

Correct Answer: C

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Question 6

95% confidence interval for mean = (45, 55). Which statement is correct?

A. Interval is fixed probability

B. Population mean always 55

C. Mean is 50

D. Population mean is 95% likely within interval

Correct Answer: D

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Question 7

In a game, a coin is tossed, and a spinner with 8 equal spaces numbered 1 through 8 is spun.
What is the probability of getting heads on the coin and a number less than 3 on the spinner?

A. 1/8

B. 1/4

C. 3/8

D. 1/2

Correct Answer: A

Question 8

There are 12 cell phone charging cords available at a store for purchase. The length of each charging cord in inches is reflected as 3, 3, 4, 6, 6, 6, 6, 7, 10, 10, 11, and 12, respectively.
What are the mean of these data?

A. 8

B. 7

C. 6

D. 9

Correct Answer: B

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Question 9

Probability sum for all outcomes = ?

A. 0

B. 1

C. > 1

D. < 1

Correct Answer: B

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Question 10

A t-distribution is used when:

A. Population categorical

B. # known, large sample

C. # unknown, small sample

D. Data continuous

Correct Answer: C

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Question 11

Two dice rolled. Probability sum = 7?

A. 5/36

B. 1/6

C. 1/12

D. 6/36

Correct Answer: D

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Question 12

Probability of rolling an even number on a six-sided die?

A. 2/3

B. 1/6

C. 1/3

D. 1/2

Correct Answer: D

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Question 13

Standard deviation squared = ?

A. Variance

B. Standard error

C. Mean

D. Median

Correct Answer: A

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WGU Applied Probability and Statistics (FZO1 C955) (Applied-Probability-and-Statistics) Free Practice Test