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A study of postoperative pain relief is conducted to determine if drug A has a significantly longer duration of pain relief than drug B. Observations of the hours of pain relief are recorded for 55 patients given drug A and 58 patients given drug B. The summary statistics are
A BMean 4.64 4.03Standard deviation 1.25 1.82
A) Formulate H(o) and H (1).
B) State the test statistic and the rejection region with x = .10.
C) State the conclusion of your test with x = .10. Also, find the P-value and comment.
Compute the probability that debt for a randomly selected borrower with good credit is more than $18,000?
People were polled on how many books they read the previous year. How many subject are needed to estimate the number of books read the previous year within one book with 99% confidence?
Evaluate the mean wait time and throughput rate
Compute the correlation and sample covariance. Compute the sample covariance and the sample correlation. Intuitively, what kind of correlation.
Compute standard error of mean? Compute the margin of error, with 95% confidence.
Your mayor just announced that the local unemployment rate dropped last month from the prior month. It went from 10.5% to 10.4%. Is this a significant drop? Explain.
A company operates four machines during three shifts each day. From production records, the data in the table below were collected.
There're several advantages of using a paired t-test. Since the same subjects are being tested in each of the varying conditions, those subjects serve as their own control.
Assuming the sample size of 40 can be considered as large, compute the confidence interval for a confidence level of 90%.
Never forget that even small effects can be statistically significant if the samples are large. Of 148 small businesses, 106 were headed by men and 42 were headed by women.
ABC Corporation has been using statistical process control for several months.
Using one mean t test to determine whether or not to support the claim - hypothesis test that WORKS THE SAME as the z-test
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