Question 5 Background: Pooled or General - which R output? In each scenario, a d

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Question 5 Background: Pooled or General - which R output? In each scenario, a decision has been made to use pooled or general t-test for comparing the two population means For each scenario, decide which of the provided R outputs must have led to the decision of using pooled or unpooled t-test. Question 5 Subquestions Does the population mean number of miles driven annually by the population of drivers who report living in rural areas (total per year, averaged per driver) differ from the population mean number of miles driven annually by the population of all drivers who report living in urban areas? To address this question, a random sample of 41 drivers living in rural areas was selected, and another random sample of 61 drivers living in urban areas was selected After analyzing the sample data, the decision has been made to perform the general (unpooled) t-test to compare the population means Which of the provided R outputs would have led to the decision to perform the general (unpooled) t-test? 0.5 point(s) leveneTest(area miles, data-Miles, center-"mean" Levene' s Test for Homogeneity of Variance (center"mean") group 1 2.3366 0.1295 > 1eveneTe st (area ~ miles, data-Miles, center-"mean"); Df F value PrOF) 100 Levene' s Test for Homogeneity of Variance (center -"mean") Df F value Pr>F) group 1 4.6355 0.03372 * 100 5.b 0.5 point(s) The post-lunch dip is the drop in mental alertness after a midday meal. Does an extract of the leaves of ginkgo tree reduce the post-lunch dip? To find out, 39 healthy participants aged 18 to 40 were randomly assigned to two groups to take either ginkgo extract or placebo. After lunch, each person was asked to read seven pages of random letters and to place an X over every e. The average number of misses per line was recorded for each person After analyzing the sample data, the decision has been made to perform the pooled t-test to compare the population means Which of the provided R outputs has led to the decision to perform the pooled t-test? mean Ginkgo 0.06383 0.01462 21 placebo 0.05342 0.01549 18 mean Ginkgo 0.06431 0.02412 21 placebo0.05349 0.01112 18

Explanation / Answer

5a)

LaveneTest give if the population variance of two groups are equal or not.

Here P-value is greater than 0.05. So population variance of two groups are equal.

We can use pooled t test.

In the second option , p - value is less than 0.05. So here we does not have to do pooled t test. So second option is correct

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