During a blood-donor program conducted during finals week for college students, a blood-pressure reading is taken first, revealing that out of 300 donors, 43 have hypertension. All answers to three places after the decimal. 1) The probability, at 60% confidence, that a given college donor will have hypertension during finals week is____, with a margin of error of___. 2)Assuming our sample of donors is among the most typical half of such samples, the true proportion of college students with hypertension during finals week is between____and ____. 3)We are 99% confident that the true proportion of college students with hypertension during finals week is____, with a margin of error of____.

1 a mand A college admissions officer takes a simple random sample of 110 entering freshmen and computes their mean mathematics SAT score to be 465. Assume the population standard deviation is = 92. Construct a 90% confidence interval for the mean mathematics SAT score for the entering freshmen class. 2 W -0 X A) (451,479) B) (373, 557) C) (446, 484) D) (463,467) # 3 80 E D C $ 4 888 R F % 5 V T G ^ 6 MacBook Air B Y H & 7 U N ** 8 J 1 1 9 M K F9 V

Suppose the manager agrees to pay each employee a$50bonus if they meet a certain goal. On a typical Saturday, the oil-change facility will perform 35 oil changes between 10 A.M. and 12 P.M. Treating this as a random sample, at what mean oil-change fime would there be a10%chance of being at or below? This will be the goal established by the manager. There would be a10%chance of being at or below minutes.

A researcher wanted to compare the pulse rates of identical twins to see whether there was any differ ence. Eight sets of twins were randomly selected. The rates are given in the table as number of beats per minute. Find the 99% confidence interval for the difference of the two. Twin A 86 93 77 80 88 90 84 92 Twin B 81 95 78 80 85 94 79 86 O 2.9 < H - H2 < 5.9 -3.1 < H1 - H2 < 6.1 -2.9 < H, - H2 < 5.9 O 3.1 < - Hz < 6.1

A dowser has correctly located water for a well 1 out of 2 times in Jones County. In Jones County, someone who is just guessing has a 40% chance of locating water for a well. Does this sample provide sufficient evidence that the dowser can locate water and is not just guessing?

Assume that the mean length of a toothpick is mu = 6 cm , with a stand deviation of sigma = 0.14 cm . 1. If we were to select one toothpick at random, what is the probability that it is longer than 6.004 cm? 2. if we weee to select a Random sample of 45 tooth picks, what is the probability that the sample mean is longer than 6.004 cm?

An audit finds that the dollar amounts of invoices have a mean of $1,662 anda standard deviation of $302. What is the probability that for a sample of 50 invoices, the average invoice is less than $1,550? O a. 0.040 O b. 0.0044 O c. 0.9956 O d. None of the suggested answers are correct O e. 0.437 In a positively skewed distribution, which of the following is the correct statement? O a. The distance from Q, to Q, is always smaller than the distance from Q, to Q3 O b. The distance from Q, to Q3 is twice the distance from the Xsmallest to Xjargest О с. None of the suggested answers are correct O d. The distance from the Xsmallest to Q2 is shorter than the distance from Q2 to Xargest е. The distance from the Xsmallest to Q1 is shorter than the distance from Q3 to Xjargest

A recent study showed that 71% of adults need some type of corrective lens (glasses or contacts). A. If I grab a 6 random people what is the probability that fewer than 4 need corrective lenses? B. If I take a random sample of 2000 people what is the mean and standard deviation of the number of people who need corrective lens? C. Use the normal approximation to the binomial to find the probability that I get 1375 or fewer people who need corrective lenses out of a random sample of 2000. Illustrate what you are finding on a sketch of the normal curve and show your work.