nnual starting salaries for college graduates with degrees in business administration ntunen $30.000 and $50.000 Assume that a 95% confidence interval estimate of
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- High-power experimental engines are being developed by the Stevens Motor Company for use in its new sports coupe. The engineers have calculated the maximum horsepower for the engine to be 600HP600HP. Nine engines are randomly selected for horsepower testing. The sample has an average maximum HP of 610610 with a standard deviation of 50HP50HP. Assume the population is normally distributed. Step 1 of 2 : Calculate a confidence interval for the average maximum HP for the experimental engine. Use a significance level of α=0.05�=0.05. Round your answers to two decimal places.Analysis showed that the mean arrival rate for vehicles at a certain Shell station on Friday afternoon last year was 4.5 vehicles per minute. How large a sample would be needed to estimate this year's mean arrival rate with 98 percent confidence and an error of ± 0.5?In a sample of 30 people, the average cost of a latte is $3.55. The standard deviation for the sample is $1.46. What is the margin of error for a 99% confidence interval? Group of answer choices $0.73 $0.69 $0.27 $0.66 thanks
- A major newspaper (that rhymes with Small Street Journal) reported an average household income for its subscribers is $119,155. Assume this estimate of the mean household income is based on a sample of 80 subscribers, and, based on past studies, the population standard deviation is known to be sigma=$30,000. Construct a 95% confidence interval for the population mean. Group of answer choices $60,356 - $177,954 $118,420 - $119,890 $112,447 - $125,863 $112,581 - $125,729A manufacturer of cell phone batteries wants to estimate the useful life of it'sthe battery (in thousand of hours.) The estimate is the be within 0.10 (100) hours.Assume a 95 percent level of confidence and that the standard deviation of theuseful life of the battery is 0.90 (900 hours). Determine the required sample size.The average cost of tuition plus room and board for a small private liberal arts college is reported to be $8500 per term but I financial administrator boys that the average cost is half a study conducted using 350 small liberal arts colleges showed that the average cost per term is $8745 the population standard deviation is $1200 let a =0.05.what is the p-value for this test
- sssss A consumer affairs investigator records the repair cost for 4 randomly selected TVs. A sample mean of $75.89 and standard deviation of $13.53 are subsequently computed. Determine the 80% confidence interval for the mean repair cost for the TVs. Assume the population is approximately normal. Step 1 of 2: Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.The average price of 350 cellphones is Php 20,000 with a sample standard deviation of Php 2500. Find the 99% confidence interval of the true average price of the cellphones.1. A survey on student behavior in some major College in Oman asked a randomly selected group of 300 students on the number of hours a week he/she reads a newspaper. The sample mean was 4.5 and standard deviation 2.9. We can assume that the underlying distribution of number of hours reading newspaper is approximately normal. a) What will be a 95% confidence interval of the population mean number of hours a College student read newspapers per week ? Interpret the same. b) Suppose you perform a similar survey at CAS, Nizwa with 35 randomly selected students; the sample mean and sample standard deviation were 5.1 and 2.6 respectively. What will be a 95% confidence interval of the population mean number of hours an CAS, Nizwa student read newspapers per week ? Interpret the interval in the context of the problem. Solve a and b
- If the level of confidence is lowered from 95% to 90 % , but the allowable error and the standard deviation remain the same, what happens to the required sample size?The operations manager at a compact fluorescent light bulb (CFL) factory needs to estimate the mean life of a large shipment of CFLs. The manufacturer’s specifications are that the standard deviation is 1,000 hours. A random sample of 64 CFLs indicated at sample mean life of 7,500 hours. Construct a 95% confidence interval estimate for the population mean life of compact fluorescent light bulbs in this shipment. Based on your confidence interval, make inference about the population parameter. Do you think that the manufacturer has a right to state that the compact fluorescent light bulbs have a mean life of 8,000 hours? Please explain. To answer these questions, is it compulsory to assume that the population compact fluorescent light bulb life is normally distributed? Why, why not. Suppose that the standard deviation changes to 800 hours. What are the answers for the first and second question?High-power experimental engines are being developed by the Stevens Motor Company for use in its new sports coupe. The engineers have calculated the maximum horsepower for the engine to be 810HP . Sixteen engines are randomly selected for horsepower testing. The sample has an average maximum HP of 890 with a standard deviation of 85HP . Assume the population is normally distributed. Step 1 of 2 : Calculate a confidence interval for the average maximum HP for the experimental engine. Use a significance level of α=0.01 . Round your answers to two decimal places.