COMM
C291FE2012_FinalVersion_Apr9

# D do not reject the null hypothesis and conclude that

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__D. Do not reject the null hypothesis, and conclude that mean retention amounts are not all equal across the different blanching processes. __E. Do not reject the null hypothesis, and conclude that mean retention amounts 18

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are all equal across the different processes. 19
Question 10. (Total 8 marks) “There are 10 types of people in the world; those who understand binary and those who don’t!” For each of the following statements, indicate whether the statements are True or False. Each statement is worth one mark; there is no penalty for a wrong answer. Circle True or False. No explanation is needed. a) If two sets of numbers have the same mean of 30 and the TRUE FALSE same standard deviation of 5, then the percentage of numbers between 25 and 35 must be the same for both sets. b) For a normal distribution, the upper and lower quartiles are TRUE FALSE respectively one standard deviation above and below the mean. c) Weight of a type of tomato has a standard deviation of 28g. TRUE FALSE If two tomatoes are weighed together, their combined weight would have standard deviation 56g. d) A correlation coefficient based on a scatter plot measuresTRUE FALSE the proportion of data lying on the regression line. e) In a hypothesis test, if the P-value is 0.01, then there is a 1% TRUE FALSE probability that the null hypothesis being tested is true. f) Suppose the residuals from a regression line predicting TRUE FALSE weight from height are all negative. This is impossible; the calculations must be wrong. g) A Type I error cannot be made if the null hypothesis TRUE FALSE is accepted. h) A chi-square goodness of fit test with one degree of freedom TRUE FALSE is equivalent to a one-sample z-test for proportion. BONUS QUESTIONS JUST FOR FUN (No marks awarded) In the following sequences – some of letters and others of numbers – find the next one or two most logical entries. The first one is a classic in the puzzle world. a) O, T, T, F, F, S, S, __ b) 2, 3, 10, 12, 13, __ c) S, T, N, D, R, D, T, __ d) 8, 5, 4, 9, 1, 7, 6, __ One more: What letter belongs at the end of the following series of words: IVY, EXCEL, SEEDY, __ *** END OF EXAM – HAVE A GOOD SUMMER! *** 20
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