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Question: Mean annual water consumption per household in a certain city is 6,800 L. The variance is 1,440,000. A random sample of 40 households in one neighborhood reveals a mean of 8,000.
a. Test the hypothesis that these households have
(i) different and
(ii) higher consumption levels than the average city household.
b. Comment on the practical significance of this result.
c. What is the PROB-VALUE for each hypothesis in part (a)?
What is the probability that all four color their hair?- What is the probability that exactly one of the four colors his hair?
Hadco Construction is a major contractor for large-scale residential, commercial and government projects. It operates a fleet of heavy duty construction equipment, for which repair and maintenance are major costs. Much of the maintenance expense..
suppose instead the data from problem 1 and 4 were taken on the same process thus the data are no longer independent.
Using the 1% significance level, test the null hypothesis that the proportions of all allergic persons are equally distributed over the four seasons.
Later, we"ll discuss a method called "backward" elimination for determining which variables to include in your final model. What about the coefficients?
Does the data suggest that true average maximum lean angle for older females is more than 10 degrees smaller than it is for younger females? State and test the relevant hypotheses at significance level .10 by obtaining a P-value.
Minimal risk? You have been invited to serve on a college's institutional review board. You must decide whether several research proposals qualify.
The revised version of the Minnesota Multiphasic Personality Inventory (MMPI-2) is the most frequently administered self-report personality measure.
a two-stage clinical trial is planned for for testing h0 p0.10 versus ha pgt0.10 where p is the proportion of
a school has three tenth grade classes. all three classes took the same physics test. the mean score for the three
Determine the percentage of data values that fall in each of the following intervals: x { 2s, x { 3s, x { 4s.
a sample of 308 subscribers to wired magazine shows the mean time spent using the internet is 14.8 hours per week with
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