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Suppose that 40% of a large number of students who have to buy a textbook for a particular course want a new copy, whereas the other 60% want a used copy. Consider randomly selecting 25 purchasers. What is the distribution of the number of students who want new books? What are the mean value and standard deviation of the number of students who want new books? What is the probability that the number of students who want new books is more than two standard deviations above the mean? The book store has 15 used book and 15 new books. If the 25 purchasers come in one by one to purchase this textbook, what is the probability that all 25 get the type of book they want from the current.
How do hypothesis-testing procedures differ for the population mean when the population standard deviation is known or unknown? What is the relationship between two-sided hypothesis tests for means and confidence intervals?
Consumer products companies design different promotional activities to accomplish different goals. According to a spokesperson for General Mills, the company's cents-off coupon offers are designed to convince people to buy its products
During the last year sales averaged $22,000 per month. Does this indicate that monthly sales have changed (in a statistically significant sense)? Use 0.05. Assume monthly sales are normally distributed.
If 9 students (9 = size of the sample) selected randomly attended the school, what's the likelihood that their mean number of attended days will be within 10 days of the population mean?
Elucidate the null and alternative hypothesis for the difference among the two means. In testing the difference between the means of two.
Report the test statistic and p-value. What is your decision and conclusion? State any assumptions you have made. Are these assumptions satisfied with these data?
Find the most powerful predictor among the six independent variables using regression.
Find the probability that both light bulbs failed the test. Find the probability that both light bulbs passed the test. find the probability that at least one light bulb failed the test.
The amount of time a bank teller spends with each customer is normally distributed with a mean of 3.10 minutes and a standard deviation of 0.40 minutes.
Provide an example of a hypothesis test you could perform at work or at home. State what the Null and the Alternative hypotheses would be in your test.
Using α = 0.05, does this sample provide enough evidence to conclude that the average utility bill in Delaware was lower in the winter of 2011-2012 than it was in the winter of 2010-2011?
A car rental office checks out an average of 30 cars per day with a standard deviation of 8 cars. If a sample of 25 days of operation is selected and the sample mean is computed.
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