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To compare lumen output of 3 different brands of light bulbs, 8 light bulbs of each brand were randomly selected and tested. The sums of squares were computed as SSTr = 591.2, SST =5364.5.
(a) State the null and alternative hypotheses for the ANOVA (include definitions of parameters). What assumptions do we need to proceed with ANOVA?
(b) Fill out the ANOVA table for this problem and carry out the test of the null hypothesis at level α = 0.05. State you conclusion.
(c) How would the conclusion of (b) be affected if the sample sizes were 4 instead of 8? Answer without doing calculations, and explain.
The scores of college-bound senior men on the math part of the SAT followed a normal distribution with mean 527 and standard deviation 116.
Comment on your statistical findings? Do you agree with your initial statement regarding the preference of an ANOVA over a t-test when examining more than two groups?
A cell phone company collects data from a random sample of 500 households. The results indicate that 135 of the households would add an extra cellular number, provided it was offered at a reduced monthly cost.
At a large commercial bakery, one of the measures used to evaluate employees is number of broken cookies per 1000 produced. The quality control department wants to determine if there is a relationship between years of experience and the broken co..
A statewide real estate company specializes in selling farm property in the state of Nebraska. Their records indicate that the mean selling time of farm property is 90 days.
At the .05 significance level, can we conclude that the guideline is still reasonable?
Given this information, what would sampling error be if sample including seven values in top row were used to calculate sample mean?
In StaTScan what is the difference between a spatial cluster size to 25% of the population risk and one with 50% window ? In StaTScan what is the difference between space-time permutation and space-time?
Evaluate the strength of the relationship by computing the coefficient of determination.
A box contains 9 tickets numbered 1 to 9 inclusive. If 3 tickets are drawn from a box one at a time, find the probability that they are alternative after (1) odd, even, odd or (2) even, odd, even.
What is the distinction between a one-sided and a two-sided hypothesis test in this problem?
Assume the arrival of these emails i3 approximated by the Poisson distribution.
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