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What are the characteristics of a normal distribution? Why is the normal distribution important in statistical analysis? What is the Standard Normal Distribution? Can you think of a variable that is normally distributed?
determine if the improvement is of practical significance one should. Crop researchers plant 100 plots with a new variety of corn. The average yield for these plots is x' = 130 bushels per acre
What is the probability that between 133 and 171 of the business travelers say that the reason for their most recent business trip was an internal company visit?
A new restaurant with 123 seats is being planned. Studies show that 57% of the customers demand a smoke free area. How many seats sould be in the non-smoking area in order to be very sure (mean + 3 Standard Deviation) of having enough seating ther..
Use the traditional method to test the given hypothesis. Assume that the population is normally distributed and that the sample has been randomly selected.
For a random sample of 23 European countries, the variance on life expetancey was 7.3 years. What is the 95% confidence interval for the variance of life expectancy in all of Europe?
An article in Parenting magazine reported that 60% of Americans needed a vacation after visiting their families for the holidays. Suppose this is the true proportion of Americans who feel this way. A random sample of 100 Americans is taken.
Tavern has budget of $2,000 for beer for Super Bowl Sunday. Betty desires to find out number of gallons of each brand of beer to order so as to maximize profit. Create a linear programming model for this problem.
Give an example of two variables that probably have a significant linear correlation coefficient, but one variable does not necessarily cause the other.
Let x be average number of employees in group health insurance plan and y be average administrative cost as percentage of claims. Determine sample correlation coefficient.
A manufacturer wishes to estimate the proportion of washing machines leaving the factory that is defective. How large a sample should she check in order to be 93 percent confident that the true proportion is estimated to within 0.014?
In a random sample of 225 students at a university, 180 stated that they were nonsmokers. Based on this sample, compute a 95% confidence interval for the proportion of all students at the university who are nonsmokers.
Suppose that each passenger may get out of the elevator at either of the 2nd or the 3rd floor. Note that 8 passengers are different. How many ways may the 8 passengers get out of the elevator?
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