Ch3 Misc Questions from SIYW 3e

Which is true of the data shown in the histogram?

I. The distribution is approximately symmetric.

II. The mean is greater than the median.

III. The median and IQR summarize the data better than the mean and standard deviation.

• I only

• II and III only

• III only

• I and III

• I'm really not sure

Two sections of a class took the same quiz. Section A had 15 students who had a mean score of 80, and Section B had 20 students who had a mean score of 90. Overall, what was the approximate mean score for all of the students on the quiz?

• 84.3

• 85.0

• 85.7

• none of these

• I'm really not sure

Your Stats teacher tells you your test score was the 1st quartile for the class. Which is true?

• I. You got 25% on the test.

• II. You can't really tell what this means without knowing the standard deviation.

• III. About 75% of your classmates got a score that was higher than your score.

• I'm really not sure

The advantage of making a stem-and-leaf display instead of a dotplot is that a stem-and-leaf

• satisfies the area principle.

• preserves the individual data values.

• shows the shape of the distribution better than a dotplot.

• A stem-and-leaf display is for quantitative data, while a dotplot shows categorical data

• I'm really not sure

Last weekend police ticketed 18 men whose mean speed was 72 miles per hour, and 30 women going an average of 64 mph. Overall, what was the mean speed of all the people ticketed?

• A) 67 mph

• B) 68 mph

• C) 69 mph

• D) none of those

Which is true of the data shown in the histogram?

I. The distribution is skewed to the right.

II. The mean is probably smaller than the median.

III. We should use median and IQR to summarize these data.

• II only

• I only

• III only

• II and III only

If we want to discuss any gaps and clusters in a data set, which of the following should not be chosen to display the data set?

• histogram

• stem-and-leaf plot

• boxplot

• any of these would work

• I'm really not sure

We might choose to display data with a stemplot rather than a boxplot because a stemplot

• I. reveals the shape of the distribution.

• II. is better for large data sets.

• III. displays the actual data.

• I'm really not sure

The distribution at the right is the number of family members reported by 25 people in the 2010 Census. The best description for the shape of this distribution is

• Unimodal and symmetric

• bimodal

• skewed right

• skewed left

• I'm really not sure

Which type of plot would be least likely to reveal that a distribution is bimodal?

• histogram

• boxplot

• stemplot

• dotplot