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A hospital administrator wants to measure average time per hip replacement procedure performed in the institution's operating suite. He is willing to be within 10 minutes of the true value with a probability of 95%. An initial investigation of a random sample of 10 cases determined that the standard deviation of time was 40 minutes.
How large a sample will need to be taken to meet the administrator's needs?
Assume that your students are a sample of all fourth graders in your state and you can use your student data to test some ideas. What is the major problem with your assumption.
Find the 93% confidence interval of the true mean. If a day care center were starting up and wanted to keep tuition low, what would be a reasonable amount to charge?
Find the critical value for a two tailed F-test with alpha=.05 when the sample size from which the variance for the numerator was obtained was 21 and the sample size from which the variance for the denominator was obtained 12
If measurements are made over span of 9 months, and results are averaged, find out the probability that neighbourhood is considered unsafe?
Graph the inequality below on the number line. b>10
A machine cuts circular filters from large rolls of material. If 7.3% of the filters fail to meet specifications, use the normal approximation to the binomial to compute the probability
A random sample of 4000 U.S. citizens yielded 2190 who are in favor of gun control legislation. Find the point estimate for estimating the proportion of all Americans who are in favor of gun control legislation.
for the same sample data and null hypothesis how does the p-value for a two-tailed test of mu compare to that for a
What is the probability that the total number of customers who enter the supermarket in one day is greater than 11700?
scores on the act test have a distribution that is approximately normal with mean 21.1 and standard deviation 5.1.what
The ages of 25 employees in a company are listed below in a stem and leaf plot. What is the probability that a worker chosen at random will have an age greater than or equal to 30 and less than or equal to 39?
An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of two emails per hour. Suppose the arrival of these emails is approximated by the Poisson distribution.
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