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Mothers under age 20 are just as likely to have twins as anybody else. Mothers under age 20 are less likely to have twins. The adage home field advantage says that sports teams tend to win more often when they are at home. Is this adage correct for baseball? Out of 2425 regular season games in 2002, the home team won 1314 of them. Does the home field advantage apply in baseball?
Independently of all the others. The system is operational if no two adjacent lamps fail. Obtain an expression for system reliability.
In a graduating class of 753 high school seniors, what is the probability that 15 or more will live beyond their 90th birthday?
Here are fifty observations on the weight of tea bags. Create mean, mode and median.
The buyer-believes that the differences are normally distributed and will use this sample to perform an appropriate test at a level of significance of 0.01.
There are 20 qualified applicants for 5 trainee positions in a fast-food management program. How many different groups of trainees can be selected?
A manager hopes to improve the sales figures for 10 employees by sending them to a motivational seminar. To test the effectiveness of this seminar
The means appear to be very close, but not the variances. At α = .05, is there a difference in variances? Show all steps clearly, including an illustration of the decision rule.
Regression analysis works with the basic formula of a line, which is Y = mX + b. We can use it to look at causation. Think about the Lemonade Stand Game.
One use of the Chi-square goodness of fit test is to determine if specified multinominal probabilities in the null hypothesis is correct.
What are the mean and the standard deviation of the number of firms that purchase a Unix machine from Sun Microsystems?
Population standard deviation is known to be 8 grams. Determine and interpret p-value for testing that mean weight of Take-a-Bite is less than 175 grams.
List all possible combinations of opinions that can be held by students A, B, and C. (Hint: There are eight possibilities.) Then give the probability of each of these outcomes. Note that they are not equally likely.
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