Medical researchers wish to test a new antibiotic, labeled A…
Medical researchers wish to test a new antibiotic, labeled A. They will compare it to the old antibiotic labeled B to see whether they are different. The researchers prepare 20 agar plates, which are sterilized and seeded with E. coli. 10 plates are randomly assigned to have antibiotic A applied, and the remaining 10 get antibiotic B. After 5 days, the percentage of E. coli on each plate (out of total bacteria on that plate) is measured. The parameter of interest in this situation is:
Read DetailsTo curb CO2 emissions, the government subsidized the purchas…
To curb CO2 emissions, the government subsidized the purchase of green vehicles. Now, a study wants to investigate whether the average CO2 emissions from cars purchased last year have dropped from the 150 g/km of 5 years. The appropriate alternative hypothesis in this situation is:
Read DetailsSuppose that last year a farmer estimated a 95% confidence i…
Suppose that last year a farmer estimated a 95% confidence interval for the population mean weight (pounds) of the Punkin variety Moonglo: (1.0,5.0). This year, the farmer decided to increase the sample size by 50% more and estimate a new 95% confidence interval. (Assume normality of the Punkin weight).a. The new width of the estimated confidence interval for the population mean weight (pounds) will [a]b. The new standard error of the sample mean will [b]c. The new margin error will [c]d. The percentile of the t distribution used in the computation will [d]
Read DetailsA simple random sample of 20 Stat 371 students from courses…
A simple random sample of 20 Stat 371 students from courses taught Fall 2019, Spring 2020, and Summer 2020 yielded the following number of Instagram followers from each student’s personal Instagram accounts. (152, 798, 1450, 1805, 1721, 330, 110, 98, 275, 102, 205,300, 130, 1022, 198, 153, 2155, 2161, 350, 1689) A 90% confidence interval for the unknown mean Stat 371 student Instagram followers is
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