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You are given the accompanying response data on concentration of a chemical as a function of time. The six sets of observations Y1 to Y6 represent different environmental conditions. Time (h) Y1 Y2 Y3 Y4 Y5 Y6 6 .38 .20 .34 .43 .10 .26 12 .74 .34 .69 .82 .16 .48 24 .84 .51 .74 .87 .18 .51 48 .70 .41 .62 .69 .19 .44 72 .43 .29 .43 .60 .15 .33 (a) Use cubic polynomial models to relate Y = concentration to X = time, where each environment is allowed to have its own intercept and response curve. Is the cubic term significant for any of the environments? [For the purposes of testing homogeneity in Part (c), retain the minimum-degree polynomial model that describes all responses.] (b) Your knowledge of the process tells you that Y must be zero when X = 0. Test the composite null hypothesis that the six intercepts are zero using the model in Part (a) as the full model. What model do you adopt based on this test? (c) Use the model determined from the test in Part (b) and test the homogeneity of the six response curves. State the conclusion of the test and give the model you have adopted at this stage.
The quality control director for a clothing manufacturer wants to study the effect of operators and machines on the breaking strength (in pounds) of wool serge material. Is there an interaction between operator and machine?
question an er nurse notices that when she and her colleagues are asked to work overtime they seem to get less sleep
a research team plans to test the null hypothesis that ? .45 sigma.5. the test is right sided. a sample size of n1550
Define irregular component in time series and explain the differences between other components as well as its effects.
A film developer claims that the mean number of pictures developed for a camera with 24 exposer is less than 22. If the hypothesis test is preformed, how should you interpret a decision a)reject the null hypothesis and b) fail to reject the null h..
when comparing your district average to the state average what is the appropriate test of the hypothesis that your
A university found that 20 percent of its students withdraw without completing the introductory statistics course. 20 students registered for a section of the course this term.
What is the best prediction for the number of complaints that will be registered for an installer who takes five sick days during the period and correlation between number of sick days and number of customer complaints statistically ..
suppose you work for an automotive engineering group that is responsible for modeling the length of life of brake
Let a success (x) be defined as a camera functioning. Find the probability that the robbery was filmed at least by one camera.
discuss some of the common uses of jq tests. do you think that iq tests should be used for these purposes? does the
1. use the normal distribution of sat critical reading scores for which the mean is 513 and the standard deviation is
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