MATH 221B L21 Quiz_ Homework

On this quiz, you may use your notes, but you should complete the quiz without help from others. This quiz is a tool to help you and your instructor gauge your progress. If needed, here's a link to the Normal Probability Applet . You will need the following data sets: MadisonCountyRealE BodyMeasurementsC When calculating anything, please remember to round to three decimal places, unless otherwise specified. DO NOT ROUND until your calculation is complete. This study source was downloaded by from CourseH on :12:59 GMT -06:00 Question 1 1 / 1 pts If the correlation coefficient ( ) is positive, when one variable decreases, the other variable: r stays the same. decreases. is unpredictable. We also need to know the strength of the association. increases. Question 2 1 / 1 pts Data was collected on homes for sale in Madison County as of January 2011. Information on the listings such as price, size of the home, and style were recorded. The data are recorded in MadisonCountyRealE . Create a scatterplot of the price of homes (ListPrice) compared with how old the homes are (Age). Select the answer that best describes the data illustrated in the scatterplot. Linear with a moderate negative association. Linear with a moderate positive association. Linear with a strong negative association. Nonlinear Use the following information to answer the next 2 questions. Researchers studying healthy body composition recorded various measurements of 252 male subjects. Height, weight, age, and other measurements were collected on each subject. The data are recorded in BodyMeasurementsC . For this exercise we will look at the height of the subjects compared with the weight. This study source was downloaded by from CourseH on :12:59 GMT -06:00 Question 3 1 / 1 pts Compute the sample correlation coefficient of the height compared with the weight. Give your answer accurate to three decimal places. (Example: 0.987) 0.487 Question 4 1 / 1 pts Create a scatterplot using these two variables. Using this scatterplot and referring to the correlation coefficient above, select the answer that best describes the data illustrated in the scatterplot.