# Exam 1 review part1.docx - Yarne Gaskins-Wallace Exam 1...

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Yarne Gaskins-WallaceExam 1 review part 11.Is the following variable categorical or quantitative?Record whether or not the literacy rate is over75%for each country in the world.
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2.A relationship between two variables is described below. We can think of onevariable as helping to explain the other. Is the indicated variable the explanatoryvariable or the response variable?
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Amount of fertilizer used is the:
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3.Hormones and Fish FertilityWhen women take birth control pills, some of the hormones found in the pills eventuallymake their way into lakes and waterways. In one study, a water sample was taken fromvarious lakes. The data indicate that as the concentration of estrogen in the lake watergoes up, the fertility level of fish in the lake goes down. The estrogen level is measured inparts per trillion (ppt) and the fertility level is recorded as the percent of eggs fertilized.One variable is concentration of estrogen in the water and another is fertility level offish.Is estrogen concentration categorical or quantitative?
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Is fertility level categorical or quantitative?
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4. Don't Text While Studying!For the 2015 Intel Science Fair, two brothers in high school recruited 47 of their classmatesto take part in a two-stage study. Participants had to read two different passages and thenanswer questions on them, and each person's score was recorded for each of the two tests.There were no distractions for one of the passages, but participants received text messageswhile they read the other passage. Participants scored significantly worse when distractedby incoming texts. Participants were also asked if they thought they were good atmultitasking (yes or no) but "even students who were confident of their abilities did just aspoorly on the test while texting."How many cases are there?47How many variables are mentioned in the description?threeHow many of these are categorical?
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How many are quantitative?
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If we created a dataset of the information with cases as rows and variables as columns, howmany rows and how many columns would the dataset have?How many rows?
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How many columns?
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