AP Statistics - Unit 1 Part 1

How would you describe this graph? 

• Symmetric
• Skewed Right
• Skewed Left
• Bimodal

Tags

CCSS.HSS.ID.A.1

CCSS.HSS.ID.A.2

CCSS.HSS.ID.A.3

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 students on the quiz?

• A. 84.3
• B. 85.0
• C. 85.7
• D. None of these

Tags

CCSS.HSS.ID.A.2

CCSS.HSS.MD.A.2

Your stats teacher tells you your test score was the 3rd quartile for the class. Which is true?

I. You got a 75% on the test.

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

III. You can't really tell what this means unless the class distribution is nearly symmetry.

• A. None of these

• B. I only

• C. II only

• D. III only

The advantage of making a stem and leaf display instead of a histogram is that a stem and leaf plot

• A. Satisfies the area principle

• B. Shows the shape of the distribution better than a dotplot

• C. Preserves the individual data values

• D. A stem and leaf display is for quantitative data, while the dotplot is for categorical data

What does s_x stand for?

• 3rd quartile

• percentile

• Sample standard deviation

• Sample mean

What does x̄ stand for?

• 3rd quartile

• percentile

• Sample standard deviation

• Sample mean

To gather data for a statistics project, a student asked 10 friends how many hours of sleep they got on the previous night. The data are shown in the following list.

7,6,5,9,3,4,7,9,5,8

What is the interquartile range (IQR) of the number of hours of sleep shown in the list?

• 3 hours

• 4 hours

• 6 hours

• 6.3 hours

• 6.5 hours

A reporter collected data on the purchase prices, in thousands of dollars, of 72 cars sold in a region. The above histogram summarizes the reporter’s data.

For a presentation on the data collected, the reporter used the median of the distribution to describe the typical purchase price. Which of the following might explain the use of median to describe the typical purchase price?

• There is an outlier between $80,000 and $85,000. Medians are resistant to outliers, while means are not.

• The number of observations that fall within a given interval is known. However, within each interval, the actual values are not known.

• The distribution is left skewed.

• The values represented in the histogram are in the thousands.

• The distribution is uniform.

Tags

CCSS.HSS.ID.A.2

CCSS.HSS.ID.A.3