__Unit 4- Regression & Correlation__

__Unit 4- Regression & Correlation__

__Lesson 1 HW Answers__

1. positive, weak, 0.527. Answers will vary

2a. Scatterplot

b. close to zero, correlation is not strong. Data is spread out and not clearly increasing or decreasing

e. r=-.214, Malissa and Matt have a very weak negative correlation. It is hard to conclude anything since this value is so close to 0. You could say that they disagree on some activities.

4a. JoJo will like it also since their correlation is strong and positive.

b. We dont know how Fallyn feels about horror movies since their correlation is so close to zero.

c. Kim will not like it since they have a strong negative correlation.

5a. linear, negative, moderate to weak, does not vary in strength, a couple outliers, teen deaths decrease as reading proficiency increases

b. 21% proficient. Yes, Mississippi fits the rest of the points pattern.

c. (73/100000)(986000)=720 deaths.

__Lesson 2 HW Answers__

1a. 301.3 Interpretation: For each additional year, the number of hippos will increase by about 301.

b. Largest Positive Residual: 1977 Estimated Residual: Answers will vary Residual: 707.9

Largest Negative Residual: 1975 Estimated Residual: Answers will vary Residual: -1,494.5

c. 16,189.8

2a. 1975

b. y-only outlier

Slope: increase Intercept: Decrease r: Increase(Get Stronger Postive)

3a. Moderately Strong Positive

b. r=0.8

c. Grape Nuts slope will decrease if Grape Nuts are removed

y=.0375x-2.784 For every additional calorie(x) the fiber(y) will increase by .0375 grams.

r=.808 There is a strong correlation between the calories and fiber in cereal.

4. r=0.92 Strong Positive r=0.42 Weak Positive r=-0.9 Strong Negative

5. The graph does look more curved, so a line may not be the best fit for the data. However, it could go either way.

Estimation: 77.301lbs

__Lesson 1 HW Answers__

__Lesson 2 HW Answers__