Unit3B Review

Unit 3B Review: Populations, Samples, and Drawing Inferences

​Unit 3 Vocabulary to Remember

​Population

Multiple Choice

A ______ is the entire set of objects from which data might be collected

• sample

• population

• numerical summary

• statistic

Multiple Choice

A _______ is a subset of the population.

• population

• numerical value

• statistic

• sample

Multiple Choice

True or False: All samples lead to a good prediction about the entire population.

• True

• False

Multiple Choice

A student wants to know which type of of pizza high school students perfer. Which of the following options is a good, representative sample of the population?

• Asking all the 10th graders in the school

• Asking 20 students from each grade level

• Asking the school principal which type of pizza he perfers

• Asking the students who walk to school

Multiple Choice

A beverage company wants to see if people in the United States like their new logo. Which of the following represents the best choice for a sample?

• a collection of shoppers from different states

• all the people living in the United States

• a selection of logo artists

• 2,000 children from ages 5-13

Multiple Choice

Which box and whisker plot has the highest median?

• Top plot
• Bottom plot

Multiple Choice

What is the range of the data set?

• 45

• 7

• 17

• 9.5

Multiple Choice

How many students scored over 80%?

• 26

• 20

• 17

• 11

Multiple Choice

How many students got 95% or higher?

• 5

• 4

• 1

• 9

Multiple Choice

Find the mean of the dot plot

• 5

• 9

• 1.5

• 10

Multiple Choice

What is the longest amount of hours slept by a 6th grader reported?

• 10

• 13

• 2

• 11

Multiple Choice

A store sells loaves of bread. The table below shows the number of loaves of bread sold each day for a week. What is the difference between the mean and median number of loaves of bread sold?

• 8
• 12
• 19
• 25

Mean Absolute Deviation

• The average distance between the data values and the mean.

• Find the mean, then find the distance between the mean and each data value.

Example: 10,12,18,11,19

• 10+12+18+11+19=70 70/5=14

• 14-10=4

• 14-12=2

• 18-14=4

• 14-11=3

• 19-14=5

• 4+2+4+3+5=18. 18/5=3.6

Multiple Choice

What is Mean Absolute Deviation?

• The mean of the data

• The absolute value of the mean

• The variation of data values around the mode

• The average distance between the data values and the mean

Multiple Choice

Find the Mean Absolute Deviation:  10, 9, 3, 8, 10.  The Mean is 8

• 3
• 5
• 1
• 2

Multiple Choice

Find the MAD:
58, 38, 54, 48, 26, 36

• 43
• 20
• 10
• 12

​Inter-Quartile Range is the distance between the lower and upper quartile.
(50% of data is within this range)

​Inter-Quartile Range (IQR)

​How to Calculate IQR:

​You must find the difference between quartile 2 and quartile 1.
Q2 - Q1
(Q1 is the middle of the lower half, Q2 is the middle of the upper half)

​Confused? Watch this video! https://youtu.be/9jYqZS142mg

Multiple Choice

Which of the following best describes the process of finding the interquartile range for a set of data?

• Add the biggest and smallest numbers.
• Place the numbers in order from least to greatest and find the middle.
• Find the difference between the maximum and the minimum.
• Subtract Q1 from Q3.

Multiple Choice

What is the difference between Q3 and Q1?

• 4
• 8
• 2
• 6

Multiple Choice

What data value is the upper quartile (Q3)?

• 64
• 62
• 66
• 58

Multiple Choice

What is the interquartile range (IQR)?

• 4
• 64
• 60
• 8

Multiple Choice

Which car club has the higher IQR and by how much?

• The Cruisers by 6

• The Car Hops by 4

• The Cruisers by 2

• The Car Hops by 2