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A 150 - 300 word response to the following
Describe when a z-test should be performed as opposed to a t-test? Which (if any) can we use all the time? Why or why not?
What is the probability that the contaminated can is selected for testing?
Joe is considering pursuing an MBA degree. He has applied to two different universities. The acceptance rate for applicants with similar qualifications is 25% for University A and 40% for University B.
Find a 95% confidence interval for the difference in the proportion of deaths between the streptokinase and the control group.
A salesperson makes four calls per day. A sample of 100 days gives the following frequencies of sales volumes.
Assume that 5,000 sales invoices are separated into four strata. Stratum 1 contains 50 invoices, stratum 2 contains 500 invoices, stratum 3 contains 1,000 invoices, and stratum 4 contains 3,450 invoices.
A permutation resample for a two-sample test
We will test to determine if there evidence of an improvement on the final examination, at the 1% significance level. What is the alternate hypothesis?
A random sample of 15 paired observations has a correlation of -.46. Can we conclude that the correlation in the population is less than zero? Use the .05 significance level.
What is the probability that a randomly selected monthly cell phone bill is more than $100?
A random sample of 100 peaches is gathered and the mean diameter is calculated. What is the probability that the sample mean is greater than 3.79 inches.
Texas Company produces and sells 22,000 units of a single product. Costs associated with this level of production are as follows:
What proportion of the variability in steel shipments for motor vehicles is described by regression equation?
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