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Select the answer you think is correct - then click the right arrow to proceed to the next question.

Question 1

Which of these variables is not likely to follow a normal curve?

Correct. The number of cigarettes each student smoked. Since most students do not smoke at all, the number of cigarettes smoked would highly skewed right.

The answer is the number of cigarettes each student smoked. Since most students do not smoke at all, the number of cigarettes smoked would highly skewed right.

Question 2

Which of these variables would be more likely to follow a normal curve?

The answer is the difference between weights. The difference between like quantities will be symmetric while the marathon times will be highly skewed.

Correct. The difference between weights. The difference between like quantities will be symmetric while the marathon times will be highly skewed.

Question 3

Which of these is true?

The answer is a standard score of zero. The median will have a positive standard score for left skewed and a negative standard score for right skewed. Since median = mean for symmetric distributions the standard score would be zero.

Correct. A standard score of zero. The median will have a positive standard score for left skewed and a negative standard score for right skewed. Since median = mean for symmetric distributions the standard score would be zero.

The answer is a standard score of zero. The median will have a positive standard score for left skewed and a negative standard score for right skewed. Since median = mean for symmetric distributions the standard score would be zero.

Question 4

To see if the height of the father is positively associated with the height of the son you should make a:

The answer is scatterplot. A scatterplot is used to visualize the association between two measurement variables.

The answer is scatterplot. A scatterplot is used to visualize the association between two measurement variables.

Correct. Scatterplot. A scatterplot is used to visualize the association between two measurement variables.

Question 5

To see if the value of gift purchases by American households is rising over the last fifty years, you would examine a:

The answer is a time series plot adjusted for inflation. Adjusting for inflation is important to make the amount spent more validly describe the value of the gift purchases.

The answer is a time series plot adjusted for inflation. Adjusting for inflation is important to make the amount spent more validly describe the value of the gift purchases.