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Unformatted text preview: Hatfield, Stat 211, Exam 1………..Page 1 of 9 Student Name________________________________ Student ID __________________________________ Section _____________________________________ Signed: _____________________________________ Note: You must fill in the above and turn in both the test and Scantron. Failure to do so will result in a grade of zero (0). Fill in this and the required fields on the Scantron, PRIOR to starting the test. I will call time at the end of the testing period and its “pencils down….no more writing”. You have Form A Hatfield, Stat 211, Exam 1………..Page 2 of 9 1. A certain television show has been on the edge of being cancelled for some time. The cutoff rate for inclusion by the network in next season’s lineup is a 35% approval rate by the audience overall. The producers feel that their approval rating is 40%, but agree to prove it to the network execs through a focus group. If the true rating of the show is actually 40%, what is the probability that out of a focus group of 20 viewers, they’re going to achieve at least the minimum acceptable approval rating? a. .926 b. .750 c. .584 d. .250 e. .074 2. The average score of the first STAT 211 exam was 65, with a standard deviation of 13. What are the upper and lower values in a range, centered around the mean, that covers 95% of the scores on that test? a. 90.48 and 39.52 b. 86.385 and 43.615 c. 100 and 0 d. 1.96 and 1.96 e. 1.645 and 1.645 3. Given the following data, calculate the mean, variance and standard deviation? 3,500 n 192,507 x x x 2 15,100,001 x a. 2 4,314.286, 0, x b. 2 7.84396, 15,100,001, 192,507 x c. 2 55.002, 1,289.434, 35.909 x d. 2 4,314.286, 61.527, 7.8439 x e. 2 4,314.286, 1,289.434, 35.909 x Hatfield, Stat 211, Exam 1………..Page 3 of 9 4. What are the two branches of statistics and how are they used, in general? a. Discrete statistics deal with a finite set of values, while continuous statistics deal with a finite set of values. b. Descriptive statistics are used to provide a breakdown of historical items, while inferential statistics allow for a generalization from a sample to a population....
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 Spring '07
 Parzen

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