Middle school students (grades 68) and high school students (grades 912) were surveyed to choose a vacation location: Hawaii or Paris. Which location would you most like to visit? Hawaii Paris Row totals Middle school students 38 12 50 High school students 26 24 50 Column totals 64 36 100 What is the marginal frequency for students who would most like to visit Hawaii? 26 33 64 100 Some researchers claim there is an association between owning a dog and developing a flea infestation at home. They took a random sample of people living in St. Louis, Missouri, and recorded whether they had a dog and whether they had a flea infestation in their home. The results are shown in the following twoway relative frequency table: Has Flea Infestation Does Not Have Flea Infestation Row Totals Does not have a dog 0.015 0.652 0.667 Has one dog 0.022 0.261 0.283 Has more than one dog 0.032 0.019 0.050 Column Totals 0.069 0.931 1 What is the conditional relative frequency of having more than one dog, given there is a flea infestation? Round your answer to the nearest thousandths place. 0.069 0.050 0.283 0.464 Some researchers claim there is an association between getting a tattoo and contracting hepatitis C. They took a random sample of people living in Los Angeles, California, and recorded whether they had a tattoo and whether they were infected with hepatitis C. The results are shown in the following twoway relative frequency table. Has Hepatitis c Does Not Have Hepatitis C Row Totals Does not have a tattoo 0.01 0.12 Has one tattoo 0.48 0.50 Has more than one tattoo 0.03 0.34 Column Totals 0.06 0.94 1 What additional data could be placed on the table? Has one tattoo and has Hepatitis C = 0.02 Has one tattoo and has Hepatitis C = 0.11 Does not have a tattoo and does not have Hepatitis C = 0.02 Does not have a tattoo and does not have Hepatitis C = 0.38 A sample of 50 high school and college students were surveyed to choose a favorite free-time activity: playing sports, dancing, or watching movies/TV. 40% of the sample is high school students. From the sample, it is found that 22% were high school students who chose playing sports, and 6% were high school students who chose dancing. 10% were college students who chose sports and 18% were college students who chose watching movies/N. 38% of the students surveyed chose dancing. Which of the following is a correct two-way relative frequency table for the data? High School and College Student Leisure Time Activity Preferences Sports Dancing Movies/TV Row Totals High school students 0.22 0.06 0.12 0.40 College students 0.10 0.32 0.18 0.60 Column totals 0.32 0.38 0.30 1 High School and College Student Leisure Time Activity Preferences Sports Dancing Movies/TV Row Totals High school students 0.11 0.03 0.06 0.40 College students 0.05 0.16 0.09 0.60 Column totals 0.16 0.19 0.15 1 High School and College Student Leisure Time Activity Preferences Sports Dancing Movies/TV Row Totals High school students 11 3 6 20 College students 5 16 9 30 Column totals 16 38 30 50 High School and College Student Leisure Time Activity Preferences Sports Dancing Movies/TV Row Totals High school students 22 6 12 40 College students 10 32 18 60 Column totals 32 38 30 100 Some researchers claim there is an association between taking vitamins and gaining weight. They took a random sample of people living in Boston, Massachusetts, and recorded whether they took vitamins and whether they gained weight. The results are shown in the following twoway table: Has Gained Weight Has Not Gained Weight Row Totals Does not take vitamins 16.9% 6.2% 23.1% Takes one vitamin per day 11.4% 16% 27.4% Takes more than one vitamin per day 23.5% 26% 49.5% Column Totals 51.8% 48.2% 1 A student reading the results stated that more than half of the study participants are taking vitamins. Determine if the student is correct. Yes, because 23.5% take one vitamin and 48.2% take more than one vitamin, which is a total of 71.7% taking vitamins. Yes, because 27.4% take one vitamin and 49.5% take more than one vitamin, which is a total of 76.9% taking vitamins. No, because 11.4% take one vitamin and 23.5% take more than one vitamin, which is a total of 34.9% taking vitamins. No, because 16% take one vitamin and 26% take more than one vitamin, which is a total of 42% taking vitamins