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STATISTIKA STKR 2270

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Twenty adult females between the ages of 25 and 35 participated in a study to evaluate the effect of a specific health regimen involving diet and exercise? on the blood trygliceride. Ten were randomly selected to be a control group, and ten others were assigned to take part in the regimen as the treatment group for a period of 6 months. The following data show the reduction in trygliceride experienced for the time period for the 20 subjects (10 each group): Control Group data: 7 8 -4 14 2 5 22 -7 -9 5 and the Treatment Group data: -6 15 9 4 4 12 27 5 13 3. These data trimmed by 10% and the means become, choose the best (Control and Treatment); ______________and ___________

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The heat evolved in calories per gram of a cement mixture is approximately normally distributed. The mean is thought to be 100 and the standard deviation is 2. We wish to test H(null): mu = 100 versus Ha: mu not equal to 100 with a sample of n = 5. If the acceptance region is defined as a mean more than 98.5, find the type I error probability of alpha.

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A car manufacturer is concerned about the effectiveness of a training course designed to get more driver to use seat belts in its automobiles. What hypothesis is he testing if he commits a type II error by erroneously concluding that the training course is effective?

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The alternative hypothesis, symbolized by H1, is a statistical hypothesis that states ___ and ___ or ____ (choose the best)

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Test variances or standard deviations, are performed using the _________ test (choose the best)

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In the hypothesis-testing situation, there are four possible outcomes: (choose the best)

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When a researcher conducts a study, he or she is generally looking for evidence to support a ______. Therefore, the _____ should be stated as the _______, or _______ (choose the best)

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The level of significance is the masixmum probability of committing a _______. This probability is symbolized by _______. That is, ______ (choose the best)

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The null hypothesis, symbolized by H0, is a statistical hypothesis that states ___ and ___ or ____ (choose the best)

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The alternative hypothesis, symbolized by H1, is a statistical hypothesis that states ___ and ___ or ____ (choose the best)

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