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exam 2

# exam 2 - 1 A23 B2 E24 A3 A25 A4 B5 E6 C7 A8 B9 A10 D11 A12...

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Unformatted text preview: 1- A23- B2- E24- A3- A25- A4- B5- E6- C7- A8- B9- A10- D11- A12- C13- E14- B15- C16- A17- D18- D19- B20- A21- A22- C(1)How well does the number of beers a student drinks predict his or her blood alcohol content? Twenty five student volunteers at a Midwestern University drank a randomly assigned number of bottles of beer during a period of time. Thirty minutes later, their blood alcohol content was measured. A scatterplot of the data appears below. The next five questions concern this data. If a student drank 8 beers, the prediction of BAC from the scatterplot would be aboutA0.17B9 C19D0.05(2)How well does the number of beers a student drinks predict his or her blood alcohol content? Twenty five student volunteers at a Midwestern University drank a randomly assigned number of bottles of beer during a period of time. Thirty minutes later, their blood alcohol content was measured. A scatterplot of the data appears below. The next five questions concern this data. A plausible value of the correlation between number of beers and blood alcohol content, based on the scatterplot, isAr = 0.9 Br =- 0.3 Cr close to 0 Dr = 0.3 Er = -0.9(3)How well does the number of beers a student drinks predict his or her blood alcohol content? Twenty five student volunteers at a Midwestern University drank a randomly assigned number of bottles of beer during a period of time. Thirty minutes later, their blood alcohol content was measured. A scatterplot of the data appears below. The next five questions concern this data. The least-squares regression line for predicting blood alcohol content from number of beers is y = 0.019x. + .003. The slope 0.019 of this line tells us thatAthe correlation between number of beers and BAC is 0.019Bon the average, BAC increases by 0.019 for each additional beer a student drinksCa student who drinks no beer will still have a BAC of 0.019Dthe average BAC of all the students in the study was 0.019(4)This question deals with this situation. The length of pregnancy for polar bears follows a normal distribution with a mean of 220 days and standard deviation of 10 days. We can say that 90% of the pregnancies will take at least how long ?...
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exam 2 - 1 A23 B2 E24 A3 A25 A4 B5 E6 C7 A8 B9 A10 D11 A12...

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