Question 1 A marketing student is estimating the average amount of money that Select one answer. students at a large university spent on sporting events last year. He 10 points asks a random sample of 50 students at one of the university football games how much they spent on sporting events last year. Using this data he computes a 90% confidence interval, which turns out to be ($217, $677). Which one of the following conclusions is valid? A. We can be 90% confident that the mean amount of money spent at sporting events last year by all the students at this university is between $217 and $677. B. 90% of the sample said they spent between $217 and $677 at sporting events last year. C. No conclusion can be drawn. Question 2 A doctor is measuring the mean systolic blood pressure of female Select one answer. students at a large college. Systolic blood pressure is known to have a 10 points skewed distribution. The doctor collects systolic blood pressure measurements from random sample of 28 female students. The resulting 90% confidence interval is (100.4, 159.6). Units of systolic blood pressure are mmHg. Which one of the following conclusions is valid? A. .90% of the female students at the college have a systolic blood pressure between 100.4 mmHg and 159.6 mmHg. B. . The sampling distribution of means will probably not follow a normal distribution, so we cannot draw a conclusion. C. .We are 90% confident that the mean systolic blood pressure for female students at the college is between 100.4 mmHg and 159.6 mmHg. Question 3 A researcher took a random sample of 100 students from a large Select one answer. university. She computed a 95% confidence interval to estimate the 5 points average weight of the students at this university. The confidence interval was too wide to provide a precise estimate. . True or false? The researcher could produce a narrower confidence interval by increasing the sample size to 150. A. True B. False Question 4 A researcher took a random sample of 100 students from a large Select one answer. university. She computed a 95% confidence interval to estimate the 5 points average weight of the students at this university. The confidence interval was too wide to provide a precise estimate. True or false? The researcher could produce a narrower confidence interval by increasing the confidence level to 99%. A. . True B. False