TAMU STAT 303 - ex2asp04 (4 pages)

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ex2asp04

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Pages:
4
School:
Texas A&M University
Course:
Stat 303 - Statistical Methods
Statistical Methods Documents

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STAT303 Secs 508 510 Spring 2004 Exam 2 Form A Instructor Julie Hagen Carroll 1 Don t EVEN open this until you are told to do so 2 There are 20 multiple choice questions on this exam each worth 5 points There is partial credit Please mark your answers clearly on the scantron Multiple marks will be counted wrong 3 You will have 60 minutes to finish this exam 4 If you are caught cheating or helping someone to cheat on this exam you both will receive a grade of zero on the exam You must work alone 5 This exam is worth 100 points and will constitute 20 of your final grade 6 Good luck 1 STAT303 508 510 Exam 2 Form A 1 If you know that a hypothesis test is statistically significant you also know A B C D E 6 Suppose the sample size in the previous problem was 30 p value 0 001 If the sample size had been 50 instead and the sample mean and standard deviation stayed the same which of the following would be true the p value is greater than the null hypothesis is rejected the alternative hypothesis is proven true All of the above are correct Only two of A B and C are correct A B C D E 2 In which of the following is the sample proportion p NOT approximately normally distributed A B C D E The sample would be more normal The p value would be more normal The p value would be larger Two of the above are true None of the above would be true 7 Suppose you re testing H0 5 vs HA 5 you get a sample mean x 4 from a sample of size 25 and you know the population is normal with a standard deviation is 2 What is the correct p value for this test n 30 0 75 n 50 0 80 n 25 0 50 n 30 0 40 p would be approximately normally in all of the situations above A You can t determine it without a computer program output B 0 9938 C 0 0062 D between 0 01 and 0 005 since it s a t test E 0 6915 3 Why do we need the distribution of our sample statistic to be normally distributed A We don t have to have them be normally distributed We just need to know what the distribution is B so we can find probabilities and



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