Unit 6 Quiz 3 Concepts

A public opinion survey of 200 people explored the association between age groups and support for an increase in the minimum wage. The results are shown in the two-way table.

What is the joint frequency of people over 60 and for a wage increase?

Answer explanation

Joint frequency refers to data in our table labeled with green on the inside

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Our answer is represented by the red box

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The answer is already shown as 50 on the table

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50 is the joint frequency of people over 60 and for a wage increase

Tags

CCSS.8.SP.A.4

A public opinion survey of 200 people explored the association between age groups and support for an increase in the minimum wage. The results are shown in the two-way table.

What is the marginal frequency of people for a wage increase?

Answer explanation

Marginal frequency refers to data in our table labeled with blue on the outside

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Our answer is represented by the red box

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The answer can be found by addition:

25 + 30 + 50 = 105

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105 is the marginal frequency of people for a wage increase

Tags

CCSS.8.SP.A.4

A public opinion survey of 200 people explored the association between age groups and support for an increase in the minimum wage. The results are shown in the two-way table.

What is the marginal frequency of people in the 21 to 40 age group?

Answer explanation

Marginal frequency refers to data in our table labeled with blue on the outside

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Our answer is represented by the red box with the question mark

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The answer can be found by remembering 200 people were surveyed:

x + 75 + 75 = 200

x + 150 = 200

x = 200 - 150

x = 50

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50 is the marginal frequency of people in the 21 to 40 age group

Tags

CCSS.8.SP.A.4

A public opinion survey of 200 people explored the association between age groups and support for an increase in the minimum wage. The results are shown in the two-way table.

What is the joint frequency of people over 60 and against a wage increase?

Answer explanation

Joint frequency refers to data in our table labeled with green on the inside

----- ----- ----- -----

Our answer is represented by the red box with the question mark

----- ----- ----- -----

The answer can be found by remembering the numbers shaded in red from the last questions, and then solving for X and Y:

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105 + 70 + y = 200

y = 200 - 105 - 70 = 25

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5 + 15 + x = 35

x = 25 - 5 - 15 = 5

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50 + ? + 5 = 75

? = 75 - 50 - 5 = 20

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20 is the joint frequency of people over 60 and against a wage increase

Tags

CCSS.8.SP.A.4

Data was collected by a lifeguard to track the number of daily visitors to a beach based upon daily temperature.

According to the data in the scatter plot, what temperature existed on a day with 225 visitors?

(only write a number in answer; don't write degrees Fahrenheit)

Answer explanation

Pay attention to the axis labels. The question gives you a y-axis value (visitors), so the answer has to be an x-axis value (temperature)

Tags

CCSS.HSF.IF.A.2

What is true about the scatter plot data?

(select all that apply)

• Negative correlation

• Positive correlation

• Decreasing function

• Increasing function

• Exponential function

Answer explanation

The scatter plot looks like a linear function with a negative correlation that decreases from left to right

Tags

CCSS.HSF-LE.A.1B