I used a sample that was larger than the population. No, the statement does not make se nse. A sample is a subset of the population and cannot be larger than the population. I wanted to test the effects of vitamin C on colds, so I gave the treatment group vitamin C and gave the control group vitamin D. The statement does not make sense. The control group should only receive a placebo, not another treatment. An exit poll designed to predict the winner of a local election uses voluntary surveys with every Republican who votes between 9 :00 and 9 : 30a.m. What sources of bias, if any, might this study have? Both selection and participation bias Discuss the differences between the following questions, each of which could be the basis for a statistical study. • What percentage of Internet dates lead to marriage? • What percentage of marriages begin with Internet dates? The questions have different populations. The stacked line chart shows the numbers of college degrees awarded to men and women over time. a. Estimate the numbers of college degrees awarded to men and to women (separately) in 1930 and in 1990. The number of college degrees awarded to men in 1930 was 75,000. The number of college degrees awarded to women in 1930 was 50,000 The number of college degrees awarded to men in 1990 was 563,000. The number of college degrees awarded to women in 1990 was 571,500. b. Compare the numbers of degrees awarded to men and to women (separately) in 1980 and 2000. Choose the correct answer below. In 1980, more men than women received degrees; in 2000, more women than men received degrees. c. During what decade did the total number of degrees awarded increase the most? 1960 d. Compare the total numbers of degrees awarded in 1950 and 2000. The total number of degrees awarded in 1950 was 444,000. The total number of degrees awarded in 2000 was 1,219,000. Consider the scatterplot to the right. a. State whether the diagram shows a positive correlation, a negative correlation, or no correlation. If there is a positive or negative correlation, is it strong or weak? b. Summarize any conclusions that can be drawn from the diagram.