AP Stats Unit

How would you describe this graph? 

• Symmetric
• Skewed Right
• Skewed Left
• Bimodal

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

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 normal.

• 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 dotplot 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 μ stand for?

• Population standard deviation
• Population mean
• Sample standard deviation
• Sample mean

What does σ stand for?

• Population standard deviation
• Population mean
• Sample standard deviation
• Sample mean

What does s_x stand for?

• Population standard deviation
• Population mean
• Sample standard deviation
• Sample mean

What does x̄ stand for?

• Population standard deviation
• Population mean
• Sample standard deviation
• Sample mean

The above table shows the number of miles a hiker walked on a trail each day for 6 days.

What was the mean number of miles the hiker walked for the 6 days?

• 3.5

• 4.5

• 6.5

• 7.5

The following list shows the number of goals scored by a soccer team in each of 9 games.

0, 0, 1, 1, 1, 3, 3, 4, 5

How does the median number of goals scored compare with the mean number of goals scored?

• The median is equal to the mean

• The median is less than the mean by 1.

• The median is greater than the mean by 1.

• The median is less than the mean by 2.