SampHe Exaxmixnati*rs Six - La Jolla High School

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Section I Sarnpte Exarnination Six tr39 17. Whioh of the following are true statements? L The alternative hypothesis is two-sided if deviation from the null h1'pothesis is relevant in either direction. IL Hypothesis tests are designed to measure the amount of evidence that exists against the alternative hypothesis. IIi. A well pianned test of hypothesis eliminates the need for a control group in an experiment. (A) I only (B) iI only (C) III only (D) I and III only (E) I, II, and III 18. Two different methods of teaching French are under consideration. In the first rnethod, a public television program is shown to the class, and a teacher spends the rest of the period revierving the concepts viewed in the program. In the second method, a textbook and traditional teaching methods are empioyed. After a period of time, an exam is administered to allthe students. The test scores of the 21 students in the first class had a standard deviation of 11.01 and the test scores of the 23 students inthe second class had a standard deviation of 17. 15. If the difference between the mean test scores of the 2 classes is 9.95, is there sufficient evidence to conclude that there is a difference between the methods? (A) We cannot draw any conclusion rvithout knowing the means of the individual classes. (B) There is sufiicient evidence to conclude that there is a difference between the methodsatd=0.05 (C) There is sufflcient evidence to conclude that there is a difference between the (D) (E) Answer methodsatd=0.01 There is insufficient evidence at a = 0.05 Since the sample sizes are different, we cannot perform any statistical analysis. Answer Unauthorized copying or any part of this page is illegal.
140 Sarnple Examination Six Section tr 19. The Central Liniit Theorem of statistics states which of the fotlowing for a sample of size n, (n > i), (A) the si,ape of the sampling distribution of sample rneans is always normal (B) the mean of the set of sample means is always less than the mean of the population (C) the standard deviatiern of the set of sample means is equal to the standard deviation of the population (D) the mean of the set cf sample means is equal to the mean of the population rvhen n is large (E) the standard deviation of the set of sarnple means is greaterthan the standard deviation of the population 20. George Washington High Schooi has a distribution of grade point averages which are approximately normally distributed with a mean of 2.5 and a standard deviation of 0.5. All students q'ith a 3.5 or higher grade point average graduate with honors. According to the Empirical Rule, approximately rvhat percentage of the students will graduate nith honors? (A) 2.5% (B) 59'o (c) t3.s% (D) 16% (E\ 9s% 2l. lf X is a normally distributed random variable with a mean deviation of 4, then P (14 < X < 82) is (A) 0.1e1s (B) 0.2417 (c) 0.4332 (D) 0.6247 (E) 1.0000 or reuslng any part of thls page ls illegal. Ansrver Answer [] of 80 and a standard Ansrver
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SampHe Exaxmixnati*rs Six - La Jolla High School

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