Using Measures of Center to Draw Inferences

Using Measures of Center to Draw Inferences

MGSE7.SP.4 Use measures of center and measures of variability for numerical data from random samples to draw informal comparative inferences about two populations.

Review the Measures of Center

Mean, Median, Mode, ...( Range and Outlier)

Multiple Choice

Which measures are affected by the outlier? (you need to find the mean, median, and mode without the outlier to answer this)

• mean

• mean and median

• mean, median, and mode

• median

Multiple Choice

Jaiden scored 71, 80, and 86 on his first three Radicals tests. What must Jaiden score on the fourth test to have a mean of exactly 80?

• 80

• 83

• 85

• 88

Multiple Choice

Gizeth’s test scores are 86, 70, 72, 100, 96, and 80. Which score must Gizeth earn on her next test to have a mean grade of exactly 85?

• 91

• 88

• 85

• 84

Multiple Choice

Mohammed’s current grades for his Delta Math assignments in Alg 1 class are 85, 90, 95, and 80. What is his average on all of these assignments?

• 80.3

• 83

• 88

• 80.8

Multiple Choice

What is the range?

• average
• biggest-smallest
• the middle #
• # happening the most

Multiple Choice

What is the mode?

• Number that occurs the most
• The Average
• The difference between the highest and lowest values
• The Number in the middle

Multiple Choice

Find the mean as a balance point

• 4
• 4.5
• 5
• 5.5

Multiple Choice

What is the median?

• The number in the middle
• The difference between the highest and lowest values
• The number that occurs the most
• The average

Multiple Choice

When finding the median what is the FIRST step?

• Mark off the lowest number
• Mark off the highest number
• Find the Middle
• Arrange the number from Least to Greatest

Multiple Choice

What is the difference between the medians?

• 16
• 12
• 8
• 4

Multiple Choice

Compare the data sets to draw an accurate conclusion.

• DVD players cost less, on average, at Store B

• The range for Store B is greater than the range for store A

• Data for store B has a greater mean, but not greater median than Store A.

• DVD players cost less, on average, at Store A.

Multiple Choice

The Table above shows the points scored by the 7th grade basketball team from the previous season. What is the mean, median and mode of the data set?

• Mean: 28

  Median: 26

  Mode: 20

• Mean: 27

  Median: 26

  Mode: 20

• Mean: 25

  Median: 28

  Mode: None

• Mean: 28

  Median: 28

  Mode: 20

Multiple Choice

The dot plots show how long it took students in Mr. Chauncey's two science classes to finish their science homework last night. Find the average to make an inference about the data.

• The 1st period mean is 35. The 2nd period mean is 38.75. On average, it took students in the 1st period class slightly longer to finish their homework than it did the students in the 2nd period class.

• The 1st period mean is 38.75. The 2nd period mean is 35. On average, it took students in the 1st period class slightly longer to finish their homework than it did the students in the 2nd period class.

• The 1st period mean is 35. The 2nd period mean is 38.75. On average, it took students in the 2nd period class slightly longer to finish their homework than it did the students in the 1st period class.

• The 1st period mean is 38.75. The 2nd period mean is 35. On average, it took students in the 2nd period class slightly longer to finish their homework than it did the students in the 1st period class.

Multiple Choice

Find the Missing Value that would make the mean of the data set 25

• 22
• 23
• 24
• 26

Multiple Choice

When finding the median what is the FIRST step?

• Mark off the lowest number
• Mark off the highest number
• Find the Middle
• Arrange the number from Least to Greatest

Multiple Choice

What is the mean?

• The number that occurs the most
• The number in the middle
• The difference between the highest and lowest values
• The Average

Multiple Choice

Find the mean of these numbers:
2, 57, 38, 42, 6

• 29
• 38
• 50
• 145

Multiple Choice

At Donald's Donuts the number of donut holes in a bag can vary. Help Donald find the mode.
12,10,10,10,13,12,11,13,10

• 13
• 12
• 11
• 10