Practice Midterm 1 Questions SP10

# A has b does not have 3 18 this data set contains one

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a. has b. does not have 3

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18. This data set contains one brand of hot dog that is both low-calorie and low-sodium. From a statistical perspective we consider this to be an influential point. a. TRUE b. FALSE 19. Match the correlation to its corresponding scatterplot below and circle the best Scatterplot # 1 Scatterplot # 2 Scatterplot # 3 For problems 20-22. A bakery wants to see if the height of a one-layer cake (in inches) is affected by the baking temperature and the rate at which the batter is stirred. They decide to investigate the effects of combinations of two temperatures (300 degrees F and 350 degrees F) and three stirring rates (60 rpm, 90 rpm, and 120 rpm) on the height of the cake. They bake 5 cakes at each combination of baking temperature and stirring rate. 20. How many subjects are there in this experiment? 21. How many factors are there in this experiment? 22. Which of the following is a confounding variable for this experiment? a. Stirring rate b. Temperature c. Height of the cake d. None of the above RECORD ALL YOUR ANSWERS ON THE ANSWER SHEET. DO NOT SHOW YOUR WORK FOR THE MC/TF QUESTIONS. 4
SHORT ANSWER PROBLEMS - 6 POINTS EACH. SHOW ALL WORK ON THE ANSWER SHEET TO GET CREDIT. CIRCLE YOUR FINAL ANSWERS ON THE ANSWER SHEET. INCLUDE PROPER UNITS. For problems 23-27. A jeweler in Singapore advertises the prices of 48 diamonds in her showroom. You record the weight of each diamond, along with the price to see whether you can predict price using weight. The line fits well, and the analysis is shown below. Weight is measured in carats (1 carat = .2 grams); price is in Singapore dollars. Descriptive Statistics: Weight, Price Total Variable Count Mean St Dev Minimum Q1 Median Q3 Maximum Weight 48 0.20417 ???? 0.12000 0.16000 0.18000 0.25000 0.35000 Price 48 500.1 213.64 223.0 336.5 428.5 661.0 1086.0 Predictor Coef SE Coef T P Constant -259.63 17.32 -14.99 0.000 Weight 3721.02 81.79 45.50 0.000 R-square: 0.91968.

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