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A clinical trial is conducted to measure the efficacy of a new drug for prevention of hypertension (defined as systolic blood pressure between 120mmHg and 139 mmHg or diastolic blood pressure betwee
In a particular area, there are just three makes of cars available: Ford (60% of the total), Renault (30%) and Honda (10%). The carburetors on Fords have a 0.09 probability of failure, those on Rena
Claim: µ = 978. Sample data: n = 23, = 934, s = 30. The sample data appear to come from a normally distributed population with s = 30.
SAT SCORES: The national average SAT score is 1019. If we suppose a normal distribution with Q=90,
A nursing school wants to determine the true mean annual income of its alumni. It randomly samples 120 of its alumni. The mean annual income was $58,700 with a standard deviation of $1,500.
An auditor wants to determine what proportion of bank's commercial loan files are incomplete. The auditor randomly samples 60 files and finds 12 are incomplete. Using 95% confidence interval, estima
At a drive through window of a bank it's found that ten customers get served every 15 minutes. The bank's manage is interested in determining a way to raise the number of customers which can be serv
A computer manufacturer claims that chips it makes are so accurate that there is only 1/2000 probability of getting a defective chip. A salesman at a local store purchased 5 chips and claimed that 2
A research shows that employee salaries at the company XYX, in thousands of dollars, are given by equation y-hat= 48.5 + 2.2 a + 1.5 b where ‘a' is the years of experience, and ‘b' is th
A researcher is interested in studying people's mean age in certain region. If the population standard deviation is known to be eight years and 1.5 year of error margin is allowed, determine the min
At the drive through window of bank it's found that 10 customers get served every 15 minutes. The bank's manage is interested in finding out a way to raise the number of customers which can be serve
A company's CEO wanted to determine the percentage of defective product per shipment. In a sample containing 500 products, he found 30 defective products.
A bank manager wanted to determine the mean number of transactions businesses make per month. For a sample of 55 businesses, he found that mean number of transaction per month to be 32 and the stand
A Mall manager claims that in average every customer spends $42 per a single visit to the mall. To test this claim, you took a sample of 49 customers and found the sample mean to be $39 and the samp
A Mall manager claims that in an average every customer spends $42 per single visit to the mall. To test this claim, you took sample of 49 customers and found the sample mean to be $39 and sample st
The monthly utility bills are normally distributed with mean value of $150 and standard deviation of $20. Determine the probability of having a utility bill between 135 and 170.
Employ the correct formula to determine the probability that, out of 25 customers, exactly 10 of them make a purchase. Show your computations or discuss how you found the probability.
A pizza restaurant manager claims that average home delivery time for their pizza is no more than 20 minutes. A random sample of 49 home delivery pizzas was collected.
A telephone answering service records the length of each call. A random sample of 12 reports yields mean length of 3.2 minutes with standard deviation of .7 minute. Compute a 95% confidence interval
Twenty students are eligible for free after school tutoring. A simple random sample of five is chosen. How many different simple random selections are possible?
Reading readiness of preschoolers from impoverished neighborhood (n=20) was measured using standardized test. Nationally, the mean on this test for preschoolers is 30.9, with SD = 2.08. What percen
In random sample of 150 clerical workers, 30 exhibit an intense dislike for their jobs. Compute a 94% confidence interval for the proportion of clerical workers who exhibit an intense dislike for th
Assume that prices of a certain model of new homes are normally distributed with mean of $150,000. Determine the percentage of buyers who paid more than $154,800 if the standard deviation is $2,400
Employ E = $136 and a confidence level of 99% and known standard deviation (sigma) of = $503. Find the minimum sample size to estimate an unknown population mean M.
Richard has been given 7-question multiple-choice quiz in his history class. Each and every question has three answers, of which only one is correct. Since Richard hasn't attended the class recently