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A buyer for a manufacturing plant suspects that his primary supplier of raw materials is overcharging. In order to determine if his suspicion is correct, he contacts a second supplier and asks for the prices on various identical materials. He wants to compare these prices with those of his primary supplier. The data collected is presented in the table below, with some summary statistics presented (all of these might not be necessary to answer the questions which follow). The buyer-believes that the differences are normally distributed and will use this sample to perform an appropriate test at a level of significance of 0.01.
Find a 90% confidence interval for the population mean weight of all such turtles.
At 95% confidence using the critical value approach, determine if the proportion of females in the company is significantly less than 50%.
Predict the final average of a student who made an 83 on the first test. Give the value of r and r squared for this model. Interpret the value of r squared in the context of this problem.
We are interested in determining whether or not the opinions of the individuals (as to Yes, No, and No Opinion) are uniformly distributed.
Produce the scatter plot for sodium and bp. Do you think there are any outliers?
Is there a difference in the extent of wound healing by treatment? (Hint: Are treatment and the percent wound healing independent?) Run the appropriate test at a 5% level of significance.
Which measure of association do you use to compare the relationship between these variables? Why?
What does it mean for two random variables to be uncorrelated?
The sample mean is 2.59 and the sample standard deviation is .66. Conduct the following test using 95% level of confidence.
Sampling distributions. Given a normal distribution with μ = 50 and standard deviation σ = 9, if a sample of n = 100 is selected.
At 5% level of significance, does this sample prove violation of guideline that average patient must pay no more than $250 out of pocket?
The Greenberg public hearing meeting turned stormy. Citizens from four suburbs were gathered at city hall to try to get the city's federal funds for their own suburbs. The government recently awarded $750,000 to the city for road improvements. The..
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