SampHe Exaxmixnati*rs Six - La Jolla High School

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Section I Sample Examination <strong>Six</strong> -tJ / 14. In testing the design of a new tennis racket, a company randomly selected 12 professional tennis players and counted the number of aces each player served when using each racket in a 2-minute period. The resurts are as follows: What is the number of degrees of freedom associated with a l-test to determine if there is a difference between the number of aces served using the 2 rackets? (A) 6 (B) 10 (c) l1 (D) 12 (E) 24 Flayer Racket #1 R.acB
138 Sarnple Examination <strong>Six</strong> Section tr 15. Evan and Am1, are t$,o seniors in a local high school. The grades on a Calculus final which Evan took weie approximately normally distributed with a mean of 75 and a standard deviation of 7. The grades on a Fsycholog.v final rvhich Amy took were also approximatell, nonnallS' Cistributed .,vith a mean of 85 and a standard deviation of 4. Evair scored an 89 on the Calcuius finai while Arny scored a 91 on the Psl,chology final. Relative to tl-re students in each class. u4ro did better on the final? (A) Evari (B) Amy (C) Both r,r,ere the same (D) You canaot compare a matlr course to a science course (E) There is not enough information to ansrver this question 16. The distribution of lengths of boa constrictors is approximately normalll'distributed. If 11.5% of these snakes are more than 147 inches long and 2.3o/o are less than 139 inches long, what are the mean and variance of tl-re lengths of boa constrictors? @) It= 142,o2= 4.72 (B) p=143,o2=2.5 (c) lt= 143,o2 = 6.25 (D) lJ = 144,O2 = 2.5 (E) p= 144,o2 = 6.25 zed copying or reusing any part of this Page is illegal. Answer EAnswer
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SampHe Exaxmixnati*rs Six - La Jolla High School

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