Warm-up A.P. Stats – Ch. 3 Activity; Stats – Linear Regression Wksheet If we are trying to predict a value of y from a value x, it is called Interpolation, if we are predicted an x-value within the range of xvalues. It is called extrapolation if we are predicted from a value of x outside the x-values. (months) Age: 18 19 20 21 22 23 24 25 26 27 Height:76 77.1 78.1 78.3 78.8 79.4 79.9 81.3 81.1 82.0 (cm) Find the Linear Regression for the data above and find the height of a 19.4 month year old. This is considered to be a(n) _____________. 2) Predict the height of 29 month old using the linear regression line from 1). This is considered to be a(n) ______________ .

A.P. Stastics and Statistics H.W. Answers E #27, and 34; AP Stats 37 27. a. 0.66 b. 0.25 c.-0.06 d. 0.04 e. 0.85 f. 0.52 g. 0.9 h. 0.74 34. R = 0.5 sx = 4.3 = 11.7 sy = 8.3 = 82.7 37 a. Life span will be longer for larger animals because it takes them longer to reach adulthood, that does not mean they have larger brains. Think alligators. b. Inflation is really to blame for increasing the prices of cheeseburgers and tuition. c. Websites have increased steadily since the creation of the internet and stock prices raise naturally due to inflation. Not related to eachother.

A.P. Statistics H.W. Answer to 38 38. a. Calorie content and fat content is 0.95 Calorie content and saturated fat content is 0.95 fat content and saturated fat content is 0.95 sodium content and calorie content is -0.5 sodium content and fat content is – 0.5 sodium conent and saturated fat content is – 0.5 b. Negative correlation indicates as one value goes up the other goes down. There might be a lurking variable affecting the relationship. c. Some cheese that had more fat, had less sodium, but that didn’t necessarily mean that all low-fat cheese had more sodium. Some manufacturers added more sodium to their lowfat cheeses to add flavor.

Computer Printout

Computing r2 from Printout

Answers to Multiple Choice 1)d 2)c 3)a 4)c 5)c 6)b 7)c 8)b 9)e

Student of the day! Block 4

Student of the day! Block 5

Student of the day! Block 6

A.P. Statistics Directions for Activity Everyone is writing on their own sheet and graph paper. Everyone is working with their table mates (3-4 people). Read carefully what you are actually graphing on paper. Notice the rubric at the end. The 10 pts for bringing the candy will be added after your score is calculated out of 100 (Score/25) + 10 = 100. Every answer for #1 – 10 should be in a complete sentence, unless you want to lose points. * When you are finished work on the Linear Regression Worksheet , I will put up specific directions about the Linear Regression worksheet soon! Follow these!!!

Statistics Directions for Quiz Answers for #1 ,2 and 4 are multiple choice. #3 has to be answered on a separate sheet of paper. a. Plot the points on graph paper and on your calculator. b. When you calculate the LSRL using your calculator you need to mark it on your graph on your graph paper. Be sure to answer c – f in complete sentences. For 3g. Make a table showing women, men (actual), predicted, and residual and use that table to show that the sum of the residuals is zero.

Statistics H.W. 3.3 H.W. Solve #37 and 38. Bring graph paper for the activity next class. Bring multiple choice problems, with Linear Regressionworksheet on the back, we will be working on this next class as well. Optional extra 10 pts to Ch. 3 Activity. Bring a bag of small square or round shaped wrapped candy like Starbursts or Jolly Ranchers.

Instructions for Linear Regression Worksheet H.W. 1) Be sure to have age as your x values and muscle mass as y. 11) You will list the residuals in order by the x values 43 45 45 … 78 Put them in a table. -11.5 14.0 -12.7 … 8.8

Table for # 11 to help with residual plot