The scatterplot to the right shows the comparison of percentage of population in

Question

The scatterplot to the right shows the comparison of percentage of population in poverty compared to percentage of students at or above proticiency in mathematics for all fifty states. The regression line is also shown. Determine whether the following are true or false. 5. Comparison of Statewide Percent in Poverty vs Statewide Math Proficiency so 30 20 10 10 15 20 25 % in Poverty As the percent of poverty increases, you would expect the percent of statewide mathematics proficiency to decrease a. b. A good guess for the correlation coefficient r is: 0.6srso.8 c. One point has an arrow pointing to it. If this point were discounted, the d. One point has an arrow pointing to it. An estimate for the residual of this e. Since the slope of the regression line is negative, the correlation coeficient correlation between the two sets of data would be stronger point would be somewhere around 17 r is also negative

Explanation / Answer

a) true because it shows a negative slope so if one variable increases the other decreases.

b) false , we cannot guess a correlation coefficient.

c) false , correlation is not affected by a single observation.

d) false , it will be somewhere around 20 , since residual is the distance between the slope and the point we are taking into consideration.

e) true ,if slope is negative that means variables have a negative correlation .

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