Sophia Statistics Unit 1 Milestone 1,.

Jenae's study ignored the fact that only some of her coffee choices had caffeine, even though her co-workers preferred caffeinated coffee. Therefore, Jenae decided to label one type of decaffeinated coffee as having caffeine to see what would happen. As she anticipated, this coffee became more popular with her co-workers, and they claimed that the extra boost of caffeine helped them focus on their work. The growing popularity of the decaffeinated coffee among co-workers, under the false impression that it gave them extra caffeine, is an example of ________. a control group a treatment group a case-control study the placebo effect RATIONALE Since no treatment of caffeine was given to these participants in the control group and they reported an effect, this is what we refer to as the placebo effect. CONCEPT Placebo 5 A survey was conducted to find the frequency with which people go to the movies. A group of 120 people in a mall were asked about how often they go out for a movie and It was found that 36 people go to movies at least once in a month. 7/8/20, 4)11 PM Sophia :: Welcome Page 3 of 15 Which of these is an example of descriptive statistics? 30% of the people who reside in the county go to movies at least once in a month. 30% of the people who visited the mall go to movies at least once in a month. 30% of the people who reside in the city go to movies at least once in a month. 30% of the people surveyed in the mall go to movies at least once in a month. RATIONALE Recall a descriptive statistic is a summary figure from a sample, which is the information at hand. From this survey a statistic would be 36 of 120 people or 30% go to the movies at least once in a month. CONCEPT Statistics Overview 6 A local school newspaper's editor wants to survey students to determine the approval rating of the current student council president.