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An official of the Iowa Department of Highways wants to compare the useful life, in months, of two brands of paint used for striping roads. The mean number of months Cooper Paint lasted was 36.2 with a standard deviation of 1.114 months. The official review 35 road stripes. For King Paint, the mean number of months was 37.0 with a standard deviation of 1.3 months. The official reviewed 40 road stripes. At the .01 significance level is there a difference in the useful life of the two paints? Compute the p-value.
Note down a research that requires a decision making with probabilities.
The instructor has "covered" Autocorrelation Function (ACF) and Partial Autocorrelation Function (PACF), but I have not yet grasped a full understanding.
Compute SS, variance, and standard deviation for following population of N = 7.Scores: 8, 1, 4, 3, 5, 3, and 4. The definitional formula works well with these scores. Use the definitional formula to compute SS.
As sample size increases, the standard error of M _______________ .
A population consists of ten items, six of which are defective. In a sample of three items, what is the probability that exactly two are defective?
Researcher wants to estimate in $300 true average amount of money country spends on road repairs each year. If she wishes to be 90% confident, how large sample is essential?
Compare population means or proportions to determine the relationship between variables.
Find a 95% confidence interval for the true proportion of voters who approve of the way the government is being run.
What is the distinction between distribution-free methods and nonparametric methods?
A defective picture tube was discovered in the latest shipment. What is the probability that it came from Tyson Wholesale?
Consider a binomial distribution with 15 identical trials, and a probability of success of 0.5. Use the normal approximation to find the probability that x = 2.
Describe the circumstances under which you should use ANOVA instead of t tests, and explain why t tests are inappropriate in these circumstances. Find a peer-reviewed article that reflects these circumstances, describe the research conducted (i.e...
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