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A statistics practitioner conducted a two-factor analysis of variance experiment with a =4, b = 3, and r = 8. The sum of squares are listed here:
SS(total) = 9420 SS(A) = 203 SS(B) = 859 SS(AB) = 513
(a) Test at the 5% significance level to determine whether factors a and b interact.
(b) Test at the 5% significance level to determine whether differences exist between the levels of factor a.
(c) Test at the 5% significance level to determine whether differences exist between the levels of factor b.
Write up your results by using scientifically recognized form.
Dr Johnson wants to know if there is sufficient evidence to conclude that the grade distribution of his class is different than the historical grade distribution. Use a =.05 and .01 and perform a goodness of fit test.
The main purpose of this exercise is to check your understanding of significance level, p-values and power .
What type of error has possibly been committed? Explain the error in ordinary language.
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The population of lengths of aluminium-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.2 inches.
Find the correlation coefficient for the data. Find the equation for the regression line for the data and predict the final grade of a student who misses 3.5 days.
Suppose you want to estimate the sample size for a multiple correlation analysis. There are five predictors in your study.
Find out the upper and lower bounds on average life expectancy of the Canadian women such that at least 90% of all population is included.
Tom works the night shift at a gas station on the edge of Champaign. One night he mixed 3 stale doughnuts in with 13 fresh doughnuts. That night 6 customers bought one doughnut each, selecting them at random. What is the probability that at least ..
For the following situation, assume the random variable is normally distributed and use a normal distribution or a t-distribution to construct a 90% confidence interval for the population mean. If convenient, use technology to construct the confid..
Testing equality of variances - evidence of a difference in the variability of monthly talking time on cell phones for men and women?
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