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The first hypothesis testing methods discussed are the Standard Normal or Z and the Student's t. The first statistic was discussed last week under Continuous Probabilities. You may want to compare and contrast these two distributions.
When do we use Z and when do we test with t?
Estimating the control chart limits from past data. Table gives data on the losses (in dollars) incurred by a hospital in treating DRG 209.
The manufacturer has recently sampled 50 customer orders. The motor manufacturer would like to determine if there is a relationship between the cost.
Compute the following probabilities: b) If X is distributed t120, find Pr(-1.99
From a random sample of 48 days in a recent year, U.S. gasoline prices had a mean of $2.34 (wow - that's old data!) and a standard deviation of $0.32. Construct the 90% and 95% confidence intervals for the population mean.
Fabric science A maker of fabric for clothing is setting up a new line to "finish" the raw fabric. The line will use either metal rollers or natural-bristle.
In light of these data, are the percentages of divorcing couples with prenuptial agreements equal in these four places?
Mean caffeine content of 146 milligrams and a standard deviation of 22 milligrams. At α = .10, do you have enough evidence to reject the shop's claim?
Many people reported seeing flashing lights in the sky last night. Apparently, the sightings were caused by the car lot grand opening
one of your companys products a flux capacitor is known to have an exponential failure time distribution with a mean of
Assuming that they wish to test the claim at alpha = 0.025, determine the rejection and non rejection regions based on your hypotheses in a). State the critical value.
Do these data provide convincing evidence that the mean amount of cola in all the bottles filled that day differs from the target value of 300 ml?
Each time a shopper purchases a tube of toothpaste. he chooses either brand A or brand B. Suppose that for each purchase after the first
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