The critical region for a directional test will be in the ___ if the prediction is that the treatment will result in an increase in scores.
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The critical region for a directional test will be in the ___ if the prediction is that the treatment will result in an increase in scores.
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- A brewery claims that the mean amount of beer in their bottles is at least 12 ounces. Determine whether the hypothesis has for this claim is left tailed, right tailed or two tailed.A study was done to determine if the time of day affected ther performance of a certain alegebra class. the same class was used in the experiment over a 6-day time span.Which of the following is the research hypothesis of one-tailed dependent t-test expecting to see a significant decrease in the observed scores? A. mean(posttest) < mean(pretest) B. mean(posttest) = mean(pretest) C. mean(posttest) > mean(pretest) D. mean(posttest) ≠ mean(pretest)
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- For all students enrolled during the previous Spring semester, it was found that 48% of all those students enrolled utilized the services of the English Study Skills Center (ESSC). This numerical measure would be considered a: A) Parameter B) StatisticResearchers recruited a sample of 40 female and 40 male heterosexual Caucasian undergraduate students from British universities for a study of the attractiveness of body types. Among adults, a body mass index (BMI, in kg/m2 ) value between 18.5 and 24.9is considered healthy, but attractiveness may not be entirely about health. Using a 3D computer avatar, participants built what they considered the ideal body of an adult of their own gender. The Minitab output for the mean ideal BMI of the women and of the men respectively is shown. From Barbie dolls to runway models, women in Western countries are exposed to unrealistically thin and arguably unhealthy body standards for their gender. Does the study provide evidence that young Caucasian women in British universities, on average, aim for an unhealthy ideal body type (corresponding to a BMI less than 18.5 )? test statistic,t = p-value =Two professors at a local college developed a new teaching curriculum designed to increase students' grades in math classes. In a typical developmental math course, 55%of the students complete the course with a letter grade of A, B, or C. In the experimental course, of the 15 students enrolled, 11 completed the course with a letter grade of A, B, or C. Is the experimental course effective at the α=0.1 level of significance? Complete parts (a) through (g).
