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A researcher believes that if she uses a different text the students will score differently on the standardized test but she doesn't know what the difference is. The test had a mean of 110 and a σ of 12. She tests a sample of 36 students and finds they score 112 on the test. Is this difference significant at the 5% level?
Alice and Bob agree to meet at the bus stop between 12 noon and 1pm. They each arrive at a random time in that interval and wait for 5 minutes before leaving, unless they see the other person. What is the probability that they meet each other?
Jim's average delivery time was 38 minutes whereas Alison's average delivery time was 40 minutes. The respective standard deviations were 5 minutes and 4 minutes.
Plot the data on the same line and give your impression regarding any apparent differences between the two companies.
When would you use ANOVA at your place of employment, in your education, or in politics? Please share the WORDS that would lead you to the null hypothesis for a specific and simple example
As the Marketing Director of Harley-Davidson, you need to determine what your customers would like in the next model. You put a survey on the Harley Web site. Is this a good frame from which to select your sample? Explain.
Using sample, determine a 98% confidence interval for mean weight of whole daily output.
Regression model results can be erroneous if multicollinearity is an issue. What causes multicollinearity? If the intercept is statistically significant, what does this tell you?
Team Marketing Report, a sports-business newsletter, estimates that the average total cost for a family of four to attend a major league baseball game is $132.
If the sales, employment, production, and other business series increase or decrease over a period of time and approximate a straight line, the equation for this growth is given by
Four brands of light bulbs are being considered for use in the final assembly area of the Saturn plant in Spring Hill, Tennessee. The director of purchasing asked for samples of 100 from each manufacturer.
Explain how one extreme score influences mean and standard deviation.
It is believed that population standard deviation is 15 days. If test is conducted using a 0.05 level of significance, what conclusion must be reached?
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