10. 11. 12. 13. 6 points 5 points 12 points 8 points A pharmaceutical company has developed a new cold remedy. To test it, they select 90 people with cold-like symptoms. Thirty people are given the product, 30 people are given a placebo, and 30 people are given nothing. The symptoms are gone from the first group in 43 hours, from the second group in 72 hours, and from the third group in 120 hours. a. What are the population and the sample in the study? b. What are the treatment and control groups? c. What are the explanatory and response variables? d. Is the new Cold remedy effective? Explain. As part of i'l'S interview process, an Typing speeds (words per minute) employment agency \"51's le otfer No offer client's typing speed. The stem- 9 s 5 3 3 s 7 s and-leaf display below shows the 3 3 4 4 3 3 o o 4 7 3 g 3 9 results for the most recent 3 s 5 2 o s o 3 4 5 s 9 clients, 19 of whom received a job 3 6 1 6 9 offer and 16 of whom did not. Key: 3545I3I3433 (a) What were the ranges of typing speeds for the two groups? (b) Which group had the higher median typing speed? (c) Which group had more typing speeds in the 60s? Each year, taxpayers can contribute money to various charities via their IRS tax forms. The following list contains the amounts of money (in dollars) donated via IRS tax forms by 9 taxpayers. 49, 92. 16, 92. 48, 21. 49. 92, 49 Find each of the following measures for the data set: 0 Mean Median Mode Range Variance Standard Deviation I I I I I Data for a standardized test are approximately normal with a mean of 250 and a standard deviation of 25. a. What score is two standard deviations below the mean? Two standard deviations above the mean? b. About what percent of the test takers scored between 200 and 275? c. About what percent of the test takers scored greater than 325? d. What is the z-score of a test score of 195? 270? 310