Scatter Plots and Linear Regression

Which scatterplot suggests a linear relationship between x and y?

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Tags

CCSS.8.F.A.3

Consider the two variables: the temperature outside (x) and the number of visitors at the beach (y). Which type of scatterplot would you expect to see when graphing?

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The scatter plot shows the number of absences in a week for classes of different sizes.  Trevor concluded that there is a positive correlation.  Which statement best describes why Trevor's conclusion was incorrect.

• The largest class does not have the most absences.
• The smallest class does not have the least number of absences.
• The data show no relationship between class size and number of absences.
• The data show a negative relationship between class size and number of absences.

Tags

CCSS.8.SP.A.1

A linear regression is the same as a line of best fit.

• true
• false

The table shown is comparing a person's foot length to their height in cm. What is the relationship between foot length and height?

• strong; r = .99
• strong; r = .97
• weak; r = .38
• weak; r = .58

Tags

CCSS.HSS.ID.C.8

The table shown is comparing a person's foot length to their height in cm. Calculate a line of best fit.

• f(x) = 5.57 + 25.05x

• f(x) = 25.05 + 5.57x

• f(x) = 25.05 - 5.57x

• f(x) = - 25.05 + 5.57x

What would be the correlation between study time and test grades?

• positive
• negative
• none
• cannot be determined

Tags

CCSS.HSS.ID.C.9

What would the correlation between elevation and temperature?

• none
• cannot be determined
• positive correlation
• negative correlation

What is the line of best fit?

• f(x)= 1.82 + 5x

• cannot be determined
• f(x)= 5.02 + 1.82x

• f(x)= 4.2 + 1.1x

Tags

CCSS.8.EE.B.5

What kind of trend is shown from this scatter plot?

• strong positive

• strong negative

• none

• weak positive

Tags

CCSS.HSS.ID.B.5