1. \ufffd\u00a0\u00a0\u00a0 For the following pair of variables, which more naturally is the response variable and which is the explanatory variable?\tCollege grade point average (GPA) and High school GPA\t\u00a0\t2. \ufffd\u00a0\u00a0\u00a0 Use the points on the right to answer the following questions.\t\u00a0\ta. \ufffd\u00a0\u00a0\u00a0 Find the scores on x and y for each point. Comment on how zx and zy relate to each other for each point.\tb. \ufffd\u00a0\u00a0\u00a0 Compute r using the z-scores for the four observations. Is this the value you expected to get for r? Why?\t\u00a0\t3. \ufffd\u00a0\u00a0\u00a0 Match the scatterplots to the right with the correlation values.\t1. r=0.9\t2. r=0.58\t3. r=0\t4. \ufffd\u00a0\u00a0\u00a0 The data on the right shows the percent of the population in a country that uses cell phones and their GDP. Let y = cell-phone use x = GDP.\t\u00a0\ta. \ufffd\u00a0\u00a0\u00a0 The graph on the right shows a scatterplot. Describe this plot in terms of the variability of cell-phone use values for nations close to 0 on GDP.\t\u00a0\tIdentify the nation that has less cell-phone use than you would expect, given their GDP.\t\u00a0\tb. \ufffd\u00a0\u00a0\u00a0 Give the x- and y- coordinates for the nation that has the highest cell-phone use.\t\u00a0\tGive the x- and y- coordinates for the nation that has the highest GDP.\t\u00a0\tc. \ufffd\u00a0\u00a0\u00a0 Would the correlation be positive , or negative? Explain.\t\u00a0\td. \ufffd\u00a0\u00a0\u00a0 Suppose you considered the correlation only for those nations having GDP above 1 Would the correlation\u00a0 be stronger, or weaker, than for all the countries?\t\u00a0\t\u00a0\t5. \ufffd\u00a0\u00a0\u00a0 For a table of national information it is found that the correlation with Internet use is 0.717 for GDP, 0.533 for cell-phone use, 0.539 for literacy, -0.859 for fertility, and 0.647 for CO2 Emissions.\t\u00a0\ta. \ufffd\u00a0\u00a0\u00a0 Which variable has the strongest linear association with internet use?\t\u00a0\tb. \ufffd\u00a0\u00a0\u00a0 Which variable has the weakest linear association with internet use?\t\u00a0\tc. \ufffd\u00a0\u00a0\u00a0 Interpret the correlation between Internet use and fertility (the mean number of children per adult woman).<\/p>\n","protected":false},"excerpt":{"rendered":"
1. \ufffd\u00a0\u00a0\u00a0 For the following pair of variables, which more naturally is the response variable and which is the explanatory variable? College grade point average (GPA) and High school GPA \u00a0 2. \ufffd\u00a0\u00a0\u00a0 Use the points on the right to Read More …<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-203774","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/www.benedictsol.com\/blogs\/wp-json\/wp\/v2\/posts\/203774","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.benedictsol.com\/blogs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.benedictsol.com\/blogs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.benedictsol.com\/blogs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.benedictsol.com\/blogs\/wp-json\/wp\/v2\/comments?post=203774"}],"version-history":[{"count":0,"href":"https:\/\/www.benedictsol.com\/blogs\/wp-json\/wp\/v2\/posts\/203774\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.benedictsol.com\/blogs\/wp-json\/wp\/v2\/media?parent=203774"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.benedictsol.com\/blogs\/wp-json\/wp\/v2\/categories?post=203774"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.benedictsol.com\/blogs\/wp-json\/wp\/v2\/tags?post=203774"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}