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The corrosive effects of various soils on coated and uncoated steel pipe was tested by using a dependent sampling plan. The data collected are summarized below, whered is the amount of corrosion on the coated portion subtracted from the amount of corrosion on the uncoated portion. Does this random sample provide sufficient reason to conclude that the coating is beneficial? Use ? = 0.01 and assume normality.
n = 43, ?d = 209, ?d2 = 6142
(a) Find t. (Give your answer correct to two decimal places.)
the following data are from an independent-measures experiment comparing two treatment conditions. do these data
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What is the 90% confidence interval estimate of the difference between two population means.
Calculate a 3-period moving average for period 7. Compute the MAD of the forecast.
You wish to determine whether consumers have made substantial progress in reducing their credit card debt? Based on a sample of 1000 consumers in September 2001,
Find the distribution of the test statistic when the null hypothesis is true, and then show how to get a test size alpha= 0.10
The diameter of small Nerf balls manufactured at a factory in China is expected to be approximately normally distributed with a mean of 5.2 inches and a standard deviation of .08 inch. Suppose a random sample of 20 balls is selected. Find the inte..
an urn contains 9 colored balls 4 orange and 5 blue. two balls are selected at random without replacement and you are
Describe ways in which the use of MS Excel as a tool for interpreting data can be used by a manager of an organization.
At the 0.05 level of significance, is there evidence of a significant relationship between the age groups and where people primarily get their news? If so explain the relationship.
Adult women in Japan have heights which are normally distributed with mean 158 centimeters and standard deviation 6 centimeters. Which country has the higher percentage of women taller than 167 centimeters?
Cletus Inc. plans to overhaul the cafeteria menu and has formed a four person team to evaluate alternatives. Calculate the importance score sum for option A?
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