COMM
C291FE2012_FinalVersion_Apr9

# Show your work to get full marks a 0 b 00013 c 02266

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the sample mean weight of the 16 bars will be less than 232 g. SHOW YOUR WORK TO GET FULL MARKS. __ A. 0 __ B. 0.0013 __ C. 0.2266 __ D. 0.7734 __ E. 0.9987 6

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Question 3. (Total 10 marks) “Showing deference to inference” 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. I. The standard error of the mean of a sample...: a) ... measures the variability of the observations TRUE FALSE b) ... is a measure of how far the sample mean is likely TRUE FALSE to be from the population mean c) ... is the accuracy with which each observation is measured TRUE FALSE d) ... is less than the estimated standard deviation TRUE FALSE of the population II. The 90% confidence limits for the mean estimated from a set of observations..: e) ... are a way of measuring the precision of the estimate TRUE FALSE of the mean f) ... are limits between which, in the long run, 90% of TRUE FALSE observations will fall g) ... are limits within which the sample mean falls with TRUE FALSE probability 0.90 h) ... are limits which would include the population mean TRUE FALSE for 90% of possible samples III. The P-value...: i) ... is the probability that the null hypothesis is true TRUE FALSE j) ...is the probability under the null hypothesis of observing TRUE FALSE such a result or one more extreme 7
Question 4. (Total 10 marks) “Q&A = Questions and Analysis (Technique)” A survey of a random sample of 400 UBC undergraduate students in third or fourth year was carried out to gather information for research about student life. Questions were asked about demographic characteristics, grades, study habits, and leisure activities. Here are some of the variables for which data were collected (they are labeled V1 through V9, for convenience). Assume that quantitative variables are normally distributed. V1 Gender (1=male, 2=female) V2 First-year overall grade (percent) V3 Second-year overall grade (percent) V4 Opinion of UBC support services (1=poor, 2=fair, 3 =good, 4=excellent) V5 Any paid part-time work? (1=yes, 2=no) V6 Total study time per week (hours) V7 Mode of travel to UBC (1=car, 2=transit, 3=bicycle, 4=walk/live on campus) V8 Are you a regular Facebook user? (1=yes, 2=no) V9 Monthly amount spent on recreational activities (dollars) For each of the following research questions, suggest which of the techniques we have studied could be used to address the question. Here is a list of techniques to choose from. Note that some may be used more than once, others not at all. Write the number of the most appropriate technique in the space to the left of the research question. 1 = One-sample z-test of a proportion 2 = Two-sample z-test of two proportions 3 = One-sample t-test of a mean 4 = Two-sample t-test of two independent means 5 = Matched pairs t-test of two dependent means 6 = Chi-square test of independence 7 = Simple linear regression 8 = Multiple regression 9 = One-way analysis of variance ___a) Is the average study time (V6) the same for males and females (V1)?

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