3 A study or the Harvard School of Public Health found that 44% of college stude
ID: 3317570 • Letter: 3
Question
3 A study or the Harvard School of Public Health found that 44% of college students are binge drinkers. A student at the University of Minnesota plans to estimate the proportion of students a U of M who are binge drinkers. How large a random sample would she need to estimate within 0.05 with 99% confidence, if before conducting the study she uses the Harvard study results as a guideline? 2 pts) 4·Horty rounds ot a new type ot ammunition were tired from a test weapon, and the muzzle velocity of the projectile was measured. The sample had a mean velocity of 1732 miles per hour, with a standard deviation of 10.5 miles per hour. a. From this description, what allows for a confidence interval for the population mean to be constructed? ( pt b. Determine a 99% confidence interval for the mean muzzle velocity. Round off your answers to nearest tenth. Label your values with appropriate units. (3 pts) 5. Companies otten tinance their daily operations by selling shares of common stock. Each share of stock in a given company represents one share of ownership in the company. One statistic monitored closely is the number of shares of stock that are bought and sold each day. T he trading volumes (rounded to the nearest million) ot General Electric stock on 11 consecutive Mondays in 2016 are listed below. Assume the population of daily trading volumes for this stock is normally distributed. 45, 43, 43, 66, 91, 53, 35, 45, 29, 64, 56 a. Use this data to compute a point estimate for the mean trading volume of G.E. stock on all Mondays. Round to the nearest tenth. (1 pt) Construct a 90% confidence interval for the mean trading volume of GE. stock on all Mondays. Round to the nearest tenth. (2 pts) b. e. Provide an accurate and realistic interpretation of this result. (8 pts)Explanation / Answer
Result:
P=0.44
For 99%, z=2.576
d=0.05
Sample size = (z2*p*(1-p))/d2
= (2.5762*0.44*0.56)/0.052
=654.022
The sample size required= 655
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