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A poll was taken of a simple random sample of movie viewers in a test audience at a new romantic comedy. The movie was given an average rating of 4.5 out of 5 by the 41 women in the audience, with a variance of 4. The 21 men in the audience gave the movie an average rating of 3.5 out of 5, with a variance of 3. Is there sufficient evidence to conclude that women in the viewing population will like the movie more than men?
Illustrate your answer with a histogram of the sample's scores and sketches of the population distribution and the distribution of means, showing the t score and cutoff points for significance.
Store used ANOVA to test if mean sales for each credit card were equal. What are the degrees of freedom for F statistic?
A doctor believes that the standard deviation of systolic blood pressure is 450. A random sample of 24 patients found a standard deviation of 520. Assume the variable is normally distributed and a = 0.01. What are the critical values?
Insurance policy from company A costs $300 a year but guarantees to replace any losses due to theft. Create the decision tree.
After six months each pilot's cholesterol level is checked again. At the 0.01 significance level, can we conclude that the program was effective in reducing cholesterol levels?
Joe thinks that no more than 20% of students in his Statistics class will get an A in the final examination. To prove his claim, he takes a random sample of 35 students and finds to his surprise that 30% of students got an A.
How do you classify statistical findings in order of power: nominal, ordinal, interval, and ratio? Give example by making up values.
How should he go about taking samples to gather data for testing the hypotheses?
What information is provided by the sign (= or -) of the Pearson correlation? What information is provided by numerical value of the Pearson correlation?
A Tamiami shearing machine is producing 10 percent defective pieces, which is abnormally high. The quality control engineer has been checking the output by almost continuous sampling since the abnormal condition began.
Sample data in a goodness-of-fit test are compared with __________. A. a predetermined or historical standard for the variable being studied
The production department wants to explore the relationship between the number of employees who assemble a subassembly and the number produced. The complete set of paired observations follows:
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