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In reporting the results of their survey of a simple random sample of U.S. registered voters, pollsters claim 95% confidence that their sampling error is no more than 4 percentage points. Given this information only, what sample size was used?
The Rustbelt Manufacturing Company employs a maintenance crew to repair its machines as needed. Management now wants a simulation study done to analyze what the size of the crew should be, where the crew sizes under consideration are 2, 3, and 4.
a search engine site claims that on average one out of five visitors clicks on an ad.a if 8 users visit the site what
At 5% level of significance, does this sample prove violation of guideline that average patient must pay no more than $250 out-of-pocket? Write your hypotheses and decision rule.
The clinic estimates that the true population standard deviation is around $2,100. If the confidence level is 95%, find the required sample size in order to meet the desired accuracy.
Using a one-sided hypothesis test with a 90% confidence level, which of the following statements do these data support?
Suppose you score a 16 on the Dental Anxiety Scale. Find the z-value for this score.- Find the probability that someone scores between a 10 and a 15 on the Dental Anxiety Scale.
Categorize the following as the example of nominal, ordinal, interval, or ratio level of measurement, and define why it represents this level: marital status of company's employees.
an auditor takes a random sample of size n110 from a large population. the population standard deviation is not known
Random sample of 40 November days (taken over many years)? Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.
To estimate p, we use the proportion p-hat in the sample who answer "Yes." Justify the use of a normal approximation and find the following probabilities.
a companyis developing a new high-performance wax for cross country ski racing. in order to justify the price marketing
A portion of a study by Wechsler (1958) reports that for 100 males taking the Wechsler Adult Intelligence Scale (WAIS), the sample mean and variance on picture completion are X‾= 9.79 and s = 2.72. Test the hypothesis H0:µ ≥ 10.5 with α = .025.
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