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A sample of 12 measurements on the tensile strength of steel bars resulted in a mean of 585 N/mm^2 and a standard deviation of 38. Estimate the true mean tensile strength of bars of this size and tyoe using 90% confidence interval. List any assumptions you need to make. Given n=150, x(bar)=477N/mm^2, and s=13.
A teacher wants to know if students in her biology class did significantly better on an exam after instruction using authentic learning. The scores pre and post test are listed below. Based on an α = .05, what can the teacher conclude?
Suppose that the proprietor of a shop determines that 60% of her customers use a credit card, 30% pay with cash, and the rest use a debit card. What is the probability that a customer does not pay with cash?
At the 0.05 significance level, test the claim that the treatment (drug or placebo) is independent of the reaction (whether or not headaches were experienced).
In the end, of course, conclusions are drawn about how an entire population would respond based on the responses from randomly selected group of people.
Suppose you always reject the null hypothesis, regardless of any sample evidence.
Find the z score corresponding to a score of X = 60 for each of the following distributions:
Using the raw measurement data presented below, calculate the t value for independent groups to determine whether or not there exists a statistically significant difference between the salaries of female and male human resource managers.
Please explain by using the traditional methods for testing hypotheses and showing the results of all steps in the process.
How many Kleenex should the kimberly Clark Corporation package of tissues contain? Researchers determined that 60 tissues is the average number of tissues used during a cold.
In order not to violate the requirements necessary to use the chi-square distribution, each expected frequency in a goodness of fit test must be:
You have a standard deck of cards and you take out 2 cards at random. Let Y1 represent the number of red Queens in your sample and let Y2 represent the number of spades in your sample.
The original simple form of the Connecticut state lottery (ignoring a few gimmicks) awarded the following prizes for each 100,000 tickets sold. The winners were chosen by drawing tickets at random. If you hold one ticket in this lottery, what is y..
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