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ExamW07

# ExamW07 - For questions 1 20 circle one answer only If...

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For questions 1 — 20, circle one answer only. If making anerror, write your final answer clearly in the margin. Ambiguous responses will be considered incorrect. 1. The mean age of five people in a roomis 30 years. One of the people whoseageis50,leavestheroom. Themeanageoftheremainingpeople is25years. T F 2. For a Normal distribution, the upper and lower quartiles are respec- tivelyonestandarddeviationaboveandbelowthemean. T F 3. Acorrelationcoefficientbasedonascatterplotmeasurestheproportion ofdatalyingontheregressionline. T F 4. A phone—in poll at a radio station concluded that 70% of Canadians approve of Stephen Harper, based on the responses of 8,000 callers. Theconclusionisvalidsincethesamplesizeislarge. T F 5. Theweightsofatypeoftomatoarebelievedtohavestandarddeviation of 28g. If two such tomatoes are weighed together, their combined weightwouldhavestandarddeviation56g. T F 6. A random sample of 100 students are asked if they are vegetarians. Five percent respond yes, and a 99% confidence interval for the true proportionofstudentswho are vegetarians isfoundto be (0 . 03 , 0 . 07) . This implies 99% of all random samples of 100 students will have a sampleproportionthatfallsbetween0.03and0.07. T F 1

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7. Confidenceintervalsareconstructedforbothparametersandstatistics. T F 8. Youcarryoutahypothesistestthatcomparesthemeansoftwopopu- lations. Supposeap-valueof0.12isobtained. Thisimpliesthatthere isa12%chancethatthetwopopulationmeansareequal. T F 9. Inlinearregression,atafixedvalueoftheexplanatoryvariable,a95% predictionintervalforanobservationoftheresponsevariableisalways widerthana95%confidenceintervalforthemeanresponse. T F 10. One-way ANOVA provides evidence against the null hypothesis that the population means are all equal when the between-group variation islargecomparedtothewithin-groupvariation. T F 11. Iftheobservationsinadatasetareallequal,then (a) thevarianceofthedatasetequals0. (b) themeanofthedatasetequals0. (c) theIQRofthedatasetequals0. (d) both(a)and(c). (e) both(b)and(c). 2
12. The slope of a regression line and the correlation are similar in the sensethat

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