Question 1

It is possible for a pair of variables to be both associated and independent.

Group of answer choices

True

False

Flag question: Question 2

Question 2

Data were collected from a local rib cook-off contest. Each contestant received a rating for their ribs. What type of variable best describes the rib ratings?

Group of answer choices

Nominal

Continuous numerical

Ordinal

Discrete numerical

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Question 3

Data were collected from babies born during the month of January. Classify the variable that represents the weight of the babies.

Group of answer choices

Ordinal

Nominal

Discrete numerical

Continuous numerical

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Question 4

A scatterplot shows a positive association between two variables. What is the best description of this graph?

Group of answer choices

The points plotted indicate a bad relationship between the variables.

The points plotted indicate an upward trend.

The points plotted indicate no trend.

The points plotted indicate a downward trend.

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Question 5

To check the accuracy of a machine filling coffee cups, every fifth cup is selected, and the number of ounces of coffee is measured. Which sampling method was used in this situation?

Group of answer choices

Stratefied sampling

Simple random sampling

Systematic sampling

Cluster sampling

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Question 6

A researcher divided subjects into two groups according to gender and then selected members from each group for her sample. What sampling method was the researcher using?

Group of answer choices

Systematic sampling

Cluster sampling

Stratefied sampling

Simple random sampling

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Question 7

Subjects were randomly assigned to two groups, and one group was given an herb and the other group a placebo. After 6 months, the numbers of respiratory tract infections each group had were compared. What type of study is demonstrated?

Group of answer choices

Experimental

Observational

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Question 8

The mean, in most cases, is not an actual data value.

Group of answer choices

True

False

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Question 9

The variance is the square root of the standard deviation.

Group of answer choices

True

False

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Question 10

Which quartile represents the data value that is greater than 75% of the data values?

Group of answer choices

Second quartile

Third quartile

First quartile

Fourth quartile

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Question 11

What percent of the data is represented by the value of the interquartile range?

Group of answer choices

75%

50%

25%

90%

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Question 17

You draw one card from a well-shuffled, standard 52-card deck.What is the probability that the card will be a Queen or a Spade?Express your answer as a decimal rounded to 3 places.

Group of answer choices

0.444

0.327

0.25

0.308

Flag question: Question 18

Question 18

John was meeting two friends in Paris, one arriving by train from Munich and the other arriving by train from Barcelona at approximately the same time.Let A and B be the events that the trains are on time.

Suppose we know from past experience that,

P(A)=0.93

P(A)=0.93

P(B)=0.89

P(B)=0.89

P(AB)=0.87

P(AB)=0.87

Find the probability that train A or train B is on time.

Group of answer choices

0.95

0.83

0.87

0.91

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Question 19

You roll two standard 6-sided dice at the same time. What is the probability that the sum of the dice isnot8? Express your answer as a fraction in simplest terms.

Group of answer choices

31/36

1/6

13/18

5/36

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Question 20

On a multiple choice quiz, there are 3 questions and 3 choices for each question (a, b, c).Bryan has not studied for the quiz and decides to randomly guess the answers.

What is the probability that he gets all of the questions correct?

Group of answer choices

3.7%

11.1%

0.04%

33.3%

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Question 21

Consider the midterm and the final for an anatomy class.Suppose 15% of students earned an A on the midterm.Of those students who earned an A on the midterm, 44% received an A on the final and 9% of the students who earned lower than an A on the midterm received an A on the final.

You randomly pick up a final exam.What is the probability that this student earned an A on the midterm and an A on the final?

Group of answer choices

approximately 0.07%

approximately 1.4%

approximately 6.6%

approximately 49%

Flag question: Question 22

Question 22

In your sock drawer you have 6 blue, 8 gray, and 3 black socks.Half asleep one morning, you grab one sock and then you grab another sock at random and put them on.Find the probability that you end up wearing 2 blue socks.

Group of answer choices

67%

11%

32%

35%

Flag question: Question 24

Question 24

IQ scores have a mean of 100 and a standard deviation of 16.Albert Einstein reportedly had an IQ of 160.Convert Einsteins IQ score to a z-score.

No rounding necessary, please type in the exact answer.

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Question 25

The total cholesterol in US men ages 35-44 is normally distributed with a mean of 209 and a standard deviation of 37.8. Find the probability that a randomly selected man in this age group has a cholesterol below 220(adapted from National Center for Health Statistics).

Use z-score and standard normal distribution table.

Group of answer choices

0.3859

0.291

not enough information

0.6141

Flag question: Question 26

Question 26

In testing a hypothesis at a level of significance of 0.05, we find the p-value to be 0.065. We can then make the following conclusion.

Group of answer choices

Accept the alternative hypothesis

Not enough information.

Reject the null hypothesis

Fail to reject the null hypothesis.

Flag question: Question 27

Question 27

We make a Type I error in hypothesis testing when we reject the null hypothesis when in fact it is true.

Group of answer choices

True

False

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Question 28

Research states the 30% of parents spank their toddlers. You decide to test this claim at a level of significance of 0.05 and randomly survey 1000 parents of toddlers. You find the 95% confidence interval to be (0.22, 0.26). From this confidence interval you decide which of the following:

Group of answer choices

Fail to reject the null hypothesis because you cannot use the confidence interval to determine the decision

Reject the null hypothesis since the claim is not in the confidence interval

Accept the alternative hypothesis

Fail to accept the alternative hypothesis

Flag question: Question 29

Question 29

X-bar is the point estimate for the population proportion.

Group of answer choices

True

False

Flag question: Question 30

Question 30

With an Alternative Hypothesis of p < 0.25, we know we are dealing with what kind of test?

Group of answer choices

Left-tail

Confidence Testing

Two-tail

Right Tail