correlation

1. A study found a correlation of r = –0.61 between the gender of a worker and his or her income. You may correctly conclude a. women earn more than men on the average. b. women earn less than men on the average. c. an arithmetic mistake was made. Correlation must be positive. d. this is incorrect because r makes no sense here. 2. One of the variables of interest for a study of adults in the United States is the person’s shoe size, measured in whole and half sizes. This variable is a. Qualitative b. Quantitative and continuous c. Quantitative and discrete d. Qualitative and continuous 3. The Columbus Zoo conducts a study to determine whether a household’s income can be used to predict the amount of money the household will give to the zoo’s annual fund drive. The response variable in this study is a. the Columbus Zoo. b. a household’s income. c. the amount of money a household gives to the zoo’s annual fund drive. d. all households in Columbus. 4. A state official wants to know which party the voters in his state feel is best qualified to lead the country over the next 10 years. He mails a questionnaire on this subject to a SRS of 1600 voters in his state. His staff reports that 325 questionnaires have been returned, of these 241 respondents feel the Democratic Party is best qualified to lead the country over the next 10 years. The sample is a. the voters in his state. b. the 325 questionnaires returned. c. the 241 voters who feel the Democratic party is best qualified. d. the 1600 voters receiving the questionnaire. Section 2: False. Each of the following statements are false. Explain why it is false, or give a counter-example showing it is false. (1 point each) 1. An experiment gathers data without trying to influence the values of the variables. 2. For the graph of X given below, the median is smaller than the mean.
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