Statistics Unit Review

Leonard asked his math class, “How many minutes does it take for you to walk to school?” He graphed the results on the line plot above.

• The mean is about 18.6; there are no gaps or outliers; a peak at 20; the data is non-symmetrical

• The median is 20; the data is symmetrical; 0 is the outlier; there are no gaps

• The mode is 20; the data is skewed right; and there is a gap at 30-35

• The range is 30; there is a peak at 20; 0 is an outlier; the data is skewed left

What statement is true about the relationship of this data?

• Over half of the players are over 65 inches.

• The range of the data is 14 inches.

• The median height of the players is 63 inches.

• The players have a mean height of 60 inches.

Mrs. Johnson wrote down the number of pages each student has read this week in the table above.

Calculate the mean, median, and mode of the data set.

• Mean - 231

  Median - 206

  Mode - 198

• Mean - 231

  Median - 213

  Mode - 198, 200

• Mean - 213

  Median - 231

  Mode - 220

• Mean - 213

  Median - 220

  Mode - 198, 220

Find the range of the data below.

30, 35, 90, 40, 20, 30, 30, 20

• 70

• 20

• 90

• 30

a question that can be answered by collecting data that vary.

• Quartiles

• Statistical Questions

• Box Plot

Is the following question statistical or non statistical?

On average, how many pencils does each classroom go through daily?

• Statistical

• Non Statistical

Choose the statistical question:

• What time did you wake up this morning?

• What time do sixth graders wake up each morning during the school week?

Which data point affects the range of the data set the most?

• 30

• 40

• 90

• 35

Sheldon, Penny, Amy, and Raj each conducted surveys on the number of televisions people have in their homes. Then, each student determined the accuracy of the following statement. All measures of central tendency must appear as a number in the set of data collected.

• Sheldon says this is sometimes true because the mean and median may or may not be in the set of data, but the mode is always in the set of data.

• Penny says this is sometimes true because the mean and mode may or may not be in the set of data, but the median is always in the set of data.

• Raj says this is always true because all the measures of central tendency also have to be numbers in the set of data.

• Amy says this is never true because all the measures of central tendency are never numbers in the set of data.

Bernadette had the following test scores: 100, 98, 71, 99. Which measure of center best describes her test scores and why?

• The range because 71 is the outlier.

• The mean because the data set does NOT have an outlier.

• The median because the data set DOES have an outlier.

• The mode because 98.5 is in the middle.