Two students in a math class compared their scores on a series of five quizzes: Student Student А B 4 6 9 5 3 7 8 5 6 Considering the concepts of both central tendency and variability, discuss (a) which student tended to perform better on the quizzes (b) which student tended to perform more consistently on quizzes
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- Suppose that a large controlled experiment tests whether caffeine improves reaction times. A very large number of randomly selected participants are randomly given identical-seeming pills with varying doses of caffeine (including none) and then given tests of reaction times under the same conditions. The experiment finds a strong negative correlation between caffeine dose and reaction time. (Note that lower reaction times are better.)In the decoration department of a company 4 people work per shift, the production supervisors remain fixed in their shift while the staff is rotating the schedule, so that they work with both supervisors.For the annual evaluation, each supervisor evaluates everyone's performance.Determine if there is a significant correlation between the two evaluations with alpha= 5%. Worker Supervisor Qualification1 Supervisor Qualification2A researcher randomly sampled 30 graduates of an MBA program and recorded data concerning their starting salaries. Of primary interest to the researcher was the effect of gender on starting salaries. The result of the pooled-variance t-test of the mean salaries of the females (Population 1) and males (Population 2) in the sample is given in the accompanying table. The researcher was attempting to show statistically that the female MBA graduates have a significantly lower mean starting salary than the male MBA graduates. Which of these is an appropriate alternative hypothesis? A. H1:μfemales≠μmales B. H1:μfemales>μmales C. H1:μfemales<μmales D. H1:μfemales=μ
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