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Question: Paired or unpaired? In each of the following settings, decide whether you should use paired t procedures or two-sample t procedures to perform inference. Explain your choice.
(a) To test the wear characteristics of two tire brands, A and B, each brand of tire is randomly assigned to 50 cars of the same make and model.
(b) To test the effect of background music on productivity, factory workers are observed. For one month, each subject works without music. For another month, the subject works while listening to music on an MP3 player. The month in which each subject listens to music is determined by a coin toss.
(c) A study was designed to compare the effectiveness of two weight-reducing diets. Fifty obese women who volunteered to participate were randomly assigned into two equal-sized groups. One group used Diet A and the other used Diet B. The weight of each woman was measured before the assigned diet and again after 10 weeks on the diet.
Formulate a statistical hypothesis appropriate for the consumer groups purpose - Compute the mean average miles per gallon and compute the sample variance and sample standard deviation.
Test the hypothesis that the proposed route is more profitable than the alternative route. Use a significance level of your choice.
Describe the properties of marginal probability and conditional probability.
The manufacturer of an airport baggage scanning machine claims it can handle an average of 530 bags per hour.
Based on the above can we reasonably conclude that more than 75% of adults are familiar with Twitter Use the adjusted Wald method and Wilson score to calculate.
Do women and men have different opinions about affirmative action? Based on a sub sample of 2008 GSS, the output figure below shows respondent's sex (sex) and attitudes toward affirmative action (DISCAFF: Are whites hurt by affirmative action).
Let's take dominance to mean 50% ownership, and suppose that a random sample of 700 VW shareholders reveals that 220 of them own Porsche shares. Conduct the left-tailed test aimed at proving that Porsche shareholders are not dominant. What is the ..
inclusions are defects in poured metal caused by contaminants. the number of large inclusions in cast iron follows a
By contrast, for General and Operations Managers, the mean hourly wage was $47.73 and the median was $40.97. Are these wage distributions likely to be symmetric, skewed left, or skewed right? Explain.
a student wants to assess whether her dog muffin tends to chase her blue ball more often than she chases her red ball.
A sports psychologist uses the body mass index (BMI) score to measure health in a sample of 60 athletes and determines that 20 are healthy, 26 are overweight.
3 section of a statistics class containing 28,32 and 35 students averaged 83,80 and 76 respectively on same final exam. what 's the combined population means of all the 3 sections ?
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