Math 1 EOC Review 2A

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A statistician collected the following data to explore the relationship between two variables, x and y. The statistician performed a linear regression and also plotted the residuals.

*Based on the residual plot, the statistician decided to exclude one data point.

*The statistician then performed linear regression on the set of remaining data points.

*The result was that the new linear model fit the remaining data more closely than the original model fit the original data.

Which data point did the statistician exclude?

• (2.3, 11.0)

• (4.2, 16.5)

• (6.4, 23.1)

• (8.2, 24.3)

Tags

CCSS.HSS.ID.B.6B

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The table below shows the US average life expectancy at birth, in years, in various decades. What is the meaning of the slope of the linear best-fit equation for the data?

• The predicted average life expectancy at birth in 1930 was about 62.7 years.

• The predicted average life expectancy at birth in 1930 was about 57.6 years.

• The average life expectancy at birth increases by about 6.7 each year.

• The average life expectancy at birth increases by about 0.2 each year.

Tags

CCSS.HSF.LE.B.5

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The table below shows the number of hours 7 students studied for a math test and the grade each student earned on the test. How does Amanda’s test score compare to the score predicted using the linear best-fit model of data for a student who studied 3.50 hours?

• Amanda scored about 5 points lower than the score predicted for a student who studied 3.50 hours.

• Amanda scored about 5 points higher than the score predicted for a student who studied 3.50 hours.

• Amanda scored about 2 points lower than the score predicted for a student who studied 3.50 hours.

• Amanda scored about 2 points higher than the score predicted for a student who studied 3.50 hours.

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Marcus measured the height, in inches, y, of plants over the course of 3 weeks. The correlation coefficient between the number of days, x, and the height of the plants is 0.85. Which could be concluded based on the correlation coefficient of the data?

• There is a strong relationship showing that as the number of days increases, the height of the plants increases.

• There is a strong relationship showing that as the number of days increases, the height of the plants decreases.

• There is a weak relationship showing that as the number of days increases, the height of the plants increases.

• There is a weak relationship showing that as the number of days increases, the height of the plants decreases.

Tags

CCSS.HSS.ID.C.8

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The table below displays the walking heart rate and running heart rate of eight girls in beats per minute (bpm). Using the linear best-fit model for the data, what is the predicted running heart rate of a girl whose walking heart rate is 100 bpm?

• 161 bpm

• 163 bpm

• 165 bpm

• 167 bpm

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The table below shows the hours, x, spent working on a new road and the distance, y, of finished road. What is the slope of the line that fits these data?

• 3

Tags

CCSS.8.EE.B.5