Unit Review Grade 7 Data

Question 1

A key helps do what in a pictograph?

Accepted Answer

Tells the reader the number of units each picture represents

Question 2

Biased or unbiased, I love to play the guitar and rock and roll. What is your favourite music?

Accepted Answer

Biased

Question 3

Find the range of these data: 46, 46, 46, 49, 52, 56, 50, 72

Accepted Answer

26

Question 4

How is the graph made to be misleading?

Accepted Answer

The y axis doesn't start at 0 making the bars look different heights

Question 5

What is the mean of this data? 2, 4, 6, 8, 10

Accepted Answer

6

Question 6

What is the mode of this set of data? 1, 14, 14, 16, 17, 21, 21, 33, 34, 39, 39, 39, 41

Accepted Answer

39

Question 7

Which of the following options has all of the pieces that are needed to make a graph?

Accepted Answer

Data, Title, Labels, Scale, Axis drawn, Legend or key, unit

Question 8

Primary data is.....

Accepted Answer

collected by a person first hand (ie. survey questioning)

Question 9

The graphs show the number of students with an average mark of 80 or higher in each grade. Which is true?

Accepted Answer

Graph 2 shows greater changes in the # of students getting 80 or higher., Graphs 2 exaggerates differences in the #of students getting 80 or higher.

Question 10

Secondary data is...

Accepted Answer

Is gathered by viewing other peoples work, Can often have bias

Question 11

Favourite colour of 42 classmates are shown. In SIMPLEST FORM, what fraction of the students chose orange as favourite?

Accepted Answer

1/7

Question 12

What is the difference between a frequency table and a tally chart?

Accepted Answer

A frequency table uses numbers to represent and display data

Question 13

The graph shows the high /low temps from Sun to Sat. Which day was the difference between high & low temps the greatest?

Accepted Answer

Tuesday

Question 14

What is the median of this data? 2, 3, 5, 9, 9, 11, 15, 19, 21, 23, 24

Accepted Answer

11

Question 15

Use the data in the frequency table. How many students receive a score of 80or higher on an English exam? *

Accepted Answer

11

Question 16

Why should you never trust math teachers who use graph paper?

Accepted Answer

They're plotting something

Question 17

What is the range of this set of data? 2, 8, 19, 22, 22, 99, 99, 99, 102

Accepted Answer

100

Question 18

Which survey question is biased? *

Accepted Answer

Do you prefer white bread or healthy, whole-wheat bread?

Question 19

List the data represented by this stem-and-leaf plot. *

Accepted Answer

67, 68, 69, 71, 73, 77, 82, 84

Questions 19