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your organization has a goal of 15 days for the average processing of a purchase request (PR) from notification to final approval. they are only concerned if it takes longer than 15 days. a sample of 25 PRs produced a mean of 15.5 days and a standard deviation of 1.5 days. test at the 10% level of significance whether they are meeting their goal.
A doctor believes that the standard deviation of systolic blood pressure is 450. A random sample of 24 patients found a standard deviation of 520. Assume the variable is normally distributed and = 0.01. What are the critical values?
a committee is to consist of 50 randomly chosen united states senators. find the expected number of different states to
Is there any statistically significant difference in how the drugs perform? If so, explain the effect. Use the post hoc tests as needed.
the labor bureau wants to estimate at a 98 confidence level the proportion of all households that receive welfare. the
State the appropriate null and alternative hypothesis for the following case: The examinations in a large freshmen chemistry class are scaled after grading.
question a national survey claims that people buy music compact disks in equal percentages for the following five age
a binomial probability experiment is conducted with the given parameters. compute the probability of x successes in the
If one invested in Stock A, Determine standard deviation of percentage return?
Make a List of type of possible errors. Assume that you were interested in knowing the mean score for a certain quiz in a statistics class.
a sewage plant produces 50000 gallons a day. 20 of the time it produces in excess of 60000 gallons what is the
Change the last number from 257 to 61 and recalculate the confidence interval. Using the results, describe the effect of an outlier or extreme value on the confidence interval.
Find a 90% confidence interval for the mean decibel level µ for this type of transit vehicle.
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