1236 Wed 16 Mar ?@L16%I coursework COUISG.WOI1 Question 8 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 a pooled or unpooled t-test. Question 8 Subquestions 8.a 1 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? 0 mean sd n Ginkgo 0.06383 0.01462 21 Placebo 0.05342 0.01549 18 0 mean sd n Ginkgo 0.06431 0.02412 21 Placebo 0.05349 0.01112 18 8.b 1 point(s) 12:36 Wed 16 Mar . . . @ 16% course.work a course.work My Account Student Log Out C Do kids whose parents are dentists tend to have fewer cavities by the age of 8 years old, on average, than kids whose parents work in a medical field unrelated to dentistry? To find out, a random sample of 18 eight-year-old kids whose parents are dentists was selected, and another random sample of 24 eight- year-old kids whose parents work in a medical field unrelated to dentistry was selected. The number of cavities was recorded for each child. 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? O Number of Cavities by the Age of 8 Years Old Number of Cavities 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 Dental Medical O Number of Cavities by the Age of 8 Years Old Number of Cavities 1.0