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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, where d 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 = 30, ?d = 207, ?d2 = 6163
(ii) Find the p-value. (Give your answer correct to four decimal places.)
Neither married nor a college graduate? (answer should be a probability, that is, a number between 0 and 1). Married but not a college graduate? (answer should be a probability, that is, a number between 0 and 1).
Are these results sufficient to conclude that the self-hypnosis has a significant effect? Assume that increasing and decreasing allergic reactions are equally likely if the training has no effect. Use an alpha of .05."
You are given an annual time series with 40 consecutive values and asked to fit a fifth-order autoregressive model.
a random sample of 200 college students taken by this researcher showed that these adults spend an average of 13.75
If 40 voters are chosen at random and X is the number of voters that support this referendum, find the standard deviation of X.
Sprinkler Systems. A manufacturer of sprinkler systems designed for fire protection claims that the average activating temperature is at least 135 degrees F.
The distribution is normal. The mean numbers of trials to learn maze for the group with the colrful wallpaper is 11. What is the standard deviation of the distribution of means?
1. State the null and research hypotheses
a sample of 200 elements from a population with a known standard deviation is selected. for an interval estimation of m
Suppose that in a random sample of size n, there are x1, x2, and x3 number of genotypes s1,s2 and s3 respectively where x1+x2+x3=n. What sort of distribution is this?
a random sample of medical files is used to estimate the proportion p of all people who have blood type b.a if you have
The 99% confidence interval using a t-distribution is ( ), ( ). Round to one decimal place as needed
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