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- According to a poll result by Gallup Institute published on June 22, 2021 says, “Solid majority of Americans,56%, approve of job Biden is doing as president,” and, “Congress’ approval slips five points to 26%, lowestsince January.” These results are based on, “telephone interviews conducted June 1~18, 2021, with arandom sample of 1,012 adults, aged 18 and older, living in all 50 U.S. states and the District of Columbia.”Answer the problems using the theory of simple random sampling.◼ 2.1. Explain why the normal distribution (z-distribution) is appropriate for the inferential analyses in this case. ◼ 2.2. Estimate the 98% confidence interval for the president’s approval rate◼ 2.3. Estimate the 95% lower confidence bound for the congress’ approval rateOn February 9, 2021, in a poll conducted by CBS News, 2821 of 5036 randomly chosen people are in favor of conviction of Donald Trump as impeachment trial begins. a) Compute a sample statistic from these data. Use appropriate notation to label your statistic.On August 24, 2010, a headline in The Boston Globe read“Researchers link chronic fatigue syndrome to class of virus”. The story reported on a study of 37 patients with the disease. 32 tested positive for a particular suspicious virus. Only 3 of 44 healthy people tested positive. A 2003 study in the Archives of Internal Medicine reported that“The over all...prevalence of CFS...was 235 per 100,000 persons.” a)Construct the contingency table for this diagnostic tool. b)Explain why this test is potentially important for research on chronic fatigue syndrome but might not be a good screening test.
- 5. First USA, a major credit card company, is planning a new offer for their current cardholders. The offer will give double miles on purchases for the next 6 months if the cardholder goes online and registers for the offer. To test the effectiveness of the campaign, First USA recently sent out offers to a random sample of 50,000 cardholders. Of those, 1284 registered. a) Construct a 95% Cl for the true proportion of those cardholders who will register for the offer. Assume the requirements are met. This Cl is for b) If the acceptance rate is only 2% or less, the campaign won't be worth the expense. Given the confidence interval you found, is the campaign worth the expense? Explain why using the Cl.Group 1 Group 2 Number in Group 1,900 1,900 Number who are expected to have a heart attack without the drug Number who are expected to have a heart attack with the drug What percentage of the group is expected to have a heart attack with the drug?Please assist from question c '****' and d, e and f
- According to the Unified Crime Report, 2006, 16% of property crimes committed in the United States were cleared by arrest or exceptional means. A research suggests that number has changed. O Ho : p = 0. 16 Ha: p +0.16 %3D OHo: p = 0. 16 Ha: p > 0.16 OHo: p=0. 16 Ha: p+0.16 OHo: p=0. 16 Ha:p>0.16 Page 12 of 15 Previous Page Next Pageis there is a main effect of disposition, would Tuckey's HSD need to be calculatedWhen applying for insurance, potential cus- tomers are asked if they have good or bad credit. Just before approving the new cus- tomer, the insurance company orders a credit report to verify the customer's actual credit rating. Historically, 49% of customers with bad credit claim they have good credit and 12% of customers with good credit misreport they have bad credit. If the insurance com- pany has set its credit standards so that 51% of approved customers have good credit, what is the probability an approved customer has good credit, given that they claimed to have good credit during the application process? Round answer to the nearest whole percent. Answer in units of percent. Answer in units of percent.
- 5. A poll is conducted and shows that 46% of homes have a landline, with a margin of error of 3%. a. Based on this poll, the percent of homes with a landline is between what two values? b. Based on this poll, can we conclude that a majority of homes don't have a landline?University of Nizwa graduate school is creating a graduate student recruiting brochure and wants to include an 1 estimate of the average monthly housing cost for a graduate student at UoN. From a list of the 150 current graduate students, a SRS of 10 students is selected and their monthly housing costs are recorded ?What is the target population.1 All UoN graduate studentsO The 10 UON graduate studentsO The monthly housing costsO Cannot be determine from the information givenO PWhat is the sampling frame.2 List of all 150 graduate studentsO List of all 10 graduate studentsO List of the graduate students housing costO Cannot be determine from the information givenO PWhat is the type of Sampling method used 3 Probability Sampling Non-probability Sampling Quota Sampling O Cannot be dete the information givena) What proportion of 20% of defective items should a supervisor in the quality system of a plastic products company accept when they ask him to evaluate a routine inspection procedure for orders of 100 identical articles, knowing that the procedure consists of taking a sample of 10 items and the one to accept the order if no more than 2 defective items are found? b) How many defective items are expected to appear in the sample?