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##### STATS 10 Misc. Problems

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Question;Question 1 of 101.0 PointsConsider the following scenario in answering questions 1 through 4.Results from previous studies showed 79% of all high school seniors from a certain city plan toattend college after graduation. A random sample of 200 high school seniors from this city revealsthat 162 plan to attend college. Does this indicate that the percentage has increased from that ofprevious studies? Test at the 5% level of significance.State the null and alternative hypotheses.A. H0: ? =.79, H1: ? >.79B. H0: p =.79, H1: p?.79C. H0: p?.79, H1: p >.79D.:0=.79, H1:>.79Reset SelectionQuestion 2 of 101.0 PointsConsider the following scenario in answering questions 1 through 4.Results from previous studies showed 79% of all high school seniors from acertain city plan to attend college after graduation. A random sample of 200 highschool seniors from this city reveals that 162 plan to attend college. Does thisindicate that the percentage has increased from that of previous studies? Test atthe 5% level of significance.Compute the z or t value of the sample test statistic.A. z = 0.69B. t = 1.645C. z = 1.96D. z = 0.62Reset SelectionQuestion 3 of 101.0 PointsConsider the following scenario in answering questions 1 through 4.Results from previous studies showed 79% of all high school seniors from a certain city plan to attend college after graduation. A random sample of 200 high school seniors from this city reveals that 162 plan to attend college. Does this indicate that the percentage has increased from that of previous studies? Test atthe 5% level of significance.What is your conclusion?A. Do not reject H0. There is not enough evidence to support the claim that the proportionof students planning to go to college is greater than.79.B. Reject H0. There is enough evidence to support the claim that the proportion ofstudents planning to go to college is now greater than.79.C. Cannot determineD. More seniors are going to collegeQuestion 4 of 101.0 PointsConsider the following scenario in answering questions 1 through 4.Results from previous studies showed 79% of all high school seniors from acertain city plan to attend college after graduation. A random sample of 200 highschool seniors from this city reveals that 162 plan to attend college. Does thisindicate that the percentage has increased from that of previous studies? Test atthe 5% level of significance.What is the p-value associated with your test of hypothesis?A. 0.7563B. 0.6874C. 0.4874D. 0.2437Reset SelectionQuestion 5 of 101.0 PointsConsider the following scenario in answering questions 5 through 7.In an article appearing in Today?s Health a writer states that the average number of calories in aserving of popcorn is 75. To determine if the average number of calories in a serving of popcorn isdifferent from 75, a nutritionist selected a random sample of 20 servings of popcorn and computedthe sample mean number of calories per serving to be 78 with a sample standard deviation of 7.State the null and alternative hypotheses.A. H0:= 75, H1:? 75B. H0:75, H1:> 75C. H0:75, H1: 75Reset SelectionQuestion 6 of 101.0 PointsConsider the following scenario in answering questions 5 through 7.In an article appearing in Today?s Health a writer states that the average number of calories in aserving of popcorn is 75. To determine if the average number of calories in a serving of popcorn isdifferent from 75, a nutritionist selected a random sample of 20 servings of popcorn and computedthe sample mean number of calories per serving to be 78 with a sample standard deviation of 7.Compute the z or t value of the sample test statistic.A. z = 1.916B. t = -1.916C. t = 1.916D. z = 1.645Reset SelectionQuestion 7 of 101.0 PointsConsider the following scenario in answering questions 5 through 7.In an article appearing in Today?s Health a writer states that the average number of calories in aserving of popcorn is 75. To determine if the average number of calories in a serving of popcorn isdifferent from 75, a nutritionist selected a random sample of 20 servings of popcorn and computedthe sample mean number of calories per serving to be 78 with a sample standard deviation of 7.At the? =.05 level of significance, does the nutritionist have enough evidence to reject thewriter?s claim?A. NoB. YesC. Cannot DetermineReset SelectionQuestion 8 of 101.0 PointsConsider the following in answering questions 8 through 10.A lab technician is tested for her consistency by taking multiple measurements ofcholesterol levels from the same blood sample. The target accuracy is a variancein measurements of 1.2 or less. If the lab technician takes 16 measurements andthe variance of the measurements in the sample is 2.2, does this provide enoughevidence to reject the claim that the lab technician?s accuracy is within the targetaccuracy?State the null and alternative hypotheses.2222A. H0:? 1.22222C. H0:?? 1.2, H1:? = 1.2D. H0:?? 1.2, H1:?? 1.2Reset SelectionQuestion 9 of 101.0 PointsConsider the following in answering questions 8 through 10.A lab technician is tested for her consistency by taking multiple measurements ofcholesterol levels from the same blood sample. The target accuracy is a variancein measurements of 1.2 or less. If the lab technician takes 16 measurements andthe variance of the measurements in the sample is 2.2, does this provide enoughevidence to reject the claim that the lab technician?s accuracy is within the targetaccuracy?Compute the value of the appropriate test statistic.A. t = 27.50B. z = 1.65C.D.= 27.50= 30.58Reset SelectionQuestion 10 of 101.0 PointsConsider the following in answering questions 8 through 10.A lab technician is tested for her consistency by taking multiple measurements ofcholesterol levels from the same blood sample. The target accuracy is a variancein measurements of 1.2 or less. If the lab technician takes 16 measurements andthe variance of the measurements in the sample is 2.2, does this provide enoughevidence to reject the claim that the lab technician?s accuracy is within the targetaccuracy?At the? =.01 level of significance, what is your conclusion?A. Do not reject H0. At the=.01 level of significance there is not sufficient evidence to suggest that this technician?s true variance is greater than the target accuracy.B. Reject H0. At the=.01 level of significance, there is enough evidence to support the claim that this technician?s variance is larger than the target accuracy.C. Cannot determineD. Reject H0. At the=.01 level of significance, there is not enough evidence to support the claim that this technician?s true variance is larger than the target accuracy.

Paper#61638 | Written in 18-Jul-2015

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