Question Question 1 of 25 0.0/ 1.0 Points For a boxplot, the vertical line inside the box indicates the location of th

Question 1 of 25

0.0/ 1.0 Points

For a boxplot, the vertical line inside the box indicates the location of the

A.median

B.mode

In C.mean

D.inter quartile range

Answer Key:

Part 2 of 9 – 2.0/ 2.0 Points

Question 2 of 25

1.0/ 1.0 Points

If events A and B are mutually exclusive, then the probability of both events occurring simultaneously is equal to

A.0.5

B.1.0

C.any value between 0.5 and 1.0

D.0.0

Answer Key:

Question 3 of 25

1.0/ 1.0 Points

If P(A) = P(A|B), then events A and B are said to be

A.complementary

B.mutually exclusive

C.exhaustive

D.independent

Answer Key:

Part 3 of 9 – 3.0/ 3.0 Points

Question 4 of 25

1.0/ 1.0 Points

Suppose that 50 identical batteries are being tested. After 8 hours of continuous use, assume that a given battery is still operating with a probability of 0.70 and has failed with a probability of 0.30.

What is the probability that greater than 40 batteries will last at least 8 hours?

A.0.0789

B.0.4538

C.0.9598

D.0.0402

Answer Key:

Question 5 of 25

1.0/ 1.0 Points

If a gambler rolls two dice and gets a sum of 10, he wins $10, and if he gets a sum of three, he wins $20. The cost to play the game is $5. What is the expectation of this game?

A.$3.06

B.-$2.78

C.-$3.06

D.$2.78

Answer Key:

Question 6 of 25

1.0/ 1.0 Points

There are two types of random variables, they are

A.real and unreal

B.exhaustive and mutually exclusive

C.complementary and cumulative

D.discrete and continuous

Answer Key:

Part 4 of 9 – 5.0/ 6.0 Points

Question 7 of 25

1.0/ 1.0 Points

The theorem that states that the sampling distribution of the sample mean is approximately normal when the sample size n is reasonably large is known as the:

A.simple random sample theorem

B.central tendency theorem

C.point estimate theorem

D.central limit theorem

Answer Key:

Question 8 of 25

1.0/ 1.0 Points

The normal distribution is:

A.a binomial distribution with only one parameter

B.a discrete distribution

C.a density function of a discrete random variable

D.the single most important distribution in statistics

Answer Key:

Question 9 of 25

1.0/ 1.0 Points

If Z is a standard normal random variable, then the value z for which P(-z < Z < z) equals 0.8764 is

A.1.16

B.0.3764

C.1.54

D.3.08

Answer Key:

Question 10 of 25

1.0/ 1.0 Points

Given that Z is a standard normal random variable, P(-1.0 < Z < 1.5) is

A.0.9332

B.0.0919

C.0.7745

D.0.8413

Answer Key:

Question 11 of 25

0.0/ 1.0 Points

One reason for standardizing random variables is to measure variables with:

A.different means and standard deviations on a non-standard scale

B.dissimilar means and similar standard deviations in like terms

In C.similar means and standard deviations on two scales

D.different means and standard deviations on a single scale

Answer Key:

Question 12 of 25

1.0/ 1.0 Points

The standard deviation of a probability distribution is a:

A.measure of variability of the distribution

B.measure of central location

C.measure of skewness of the distribution

D.measure of relative likelihood

Answer Key:

Part 5 of 9 – 1.0/ 1.0 Points

Question 13 of 25

1.0/ 1.0 Points

Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), “E” or “e” (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.

Complex numbers should be in the form (a + bi) where “a” and “b” need to have explicitly stated values.

For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.

A sample of 150 students at a State University was taken after the final business statistics exam to ask them whether they went partying the weekend before the final or spent the weekend studying, and whether they did well or poorly on the final. The following table contains the result.

Did Well on Exam Did Poorly on Exam

Studying for Exam 60 15

Went Partying 22 53

If the sample is a good representation of the population, what percentage of the students in the population should we expect to spend the weekend studying and do poorly on the final exam? Place your answer in the blank, rounded to 2 decimal places. Do not use a percentage sign (%). For example, 44.44 would be a legitimate answer. 10.00

Answer Key:

Part 6 of 9 – 2.0/ 2.0 Points

Question 14 of 25

1.0/ 1.0 Points

Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), “E” or “e” (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.

Complex numbers should be in the form (a + bi) where “a” and “b” need to have explicitly stated values.

For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.

Find the mean of the distribution shown below.

X 0 1 2

P(X) 0.24 0.31 0.45

Round your answer to two decimal place as necessary. For example, 4.56 would be a legitimate entry.

Mean = 1.21

Answer Key:

Feedback: Expected value = (0)(0.24) + (1)(0.31) + (2)(0.45) = 1.21

Question 15 of 25

1.0/ 1.0 Points

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