Is the following variable categorical or...

This preview shows page 1 - 3 out of 8 pages.

Yarne Gaskins-Wallace Exam 1 review part 1 1. Is the following variable categorical or quantitative? Record whether or not the literacy rate is over 75% for each country in the world.
2. A relationship between two variables is described below. We can think of one variable as helping to explain the other. Is the indicated variable the explanatory variable or the response variable?
Amount of fertilizer used is the:
3. Hormones and Fish Fertility When women take birth control pills, some of the hormones found in the pills eventually make their way into lakes and waterways. In one study, a water sample was taken from various lakes. The data indicate that as the concentration of estrogen in the lake water goes up, the fertility level of fish in the lake goes down. The estrogen level is measured in parts 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 of fish. Is estrogen concentration categorical or quantitative?
Is fertility level categorical or quantitative?
4. Don't Text While Studying! For the 2015 Intel Science Fair, two brothers in high school recruited 47 of their classmates to take part in a two-stage study. Participants had to read two different passages and then answer 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 messages while they read the other passage. Participants scored significantly worse when distracted by incoming texts. Participants were also asked if they thought they were good at multitasking (yes or no) but "even students who were confident of their abilities did just as poorly on the test while texting." How many cases are there? 47 How many variables are mentioned in the description? three How many of these are categorical?
How many are quantitative?
If we created a dataset of the information with cases as rows and variables as columns, how many rows and how many columns would the dataset have? How many rows?
How many columns?

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture