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The owner of a mail-order catalog would like to compare her sales with the geographic distribution of the population. According to the United States Bureau of the Census, 21 percent of the population lives in the Northeast, 24 percent in the Midwest, 35 percent in the South, and 20 percent in the West. Listed below is a breakdown of a sample of 400 orders randomly selected from those shipped last month. At the .01 significance level, does the distribution of the orders reflect the population?
Region Frequency
Northeast 68
Midwest 104
South 155
West 73
Total 400
The cheetahs' coach believes that the Rockets' times are normally distributed as well. Construct a 95% confidence interval the Coach to compare the two teams' sprint units.
The chance both flights are full is 0.6. Are the two flights being full independent events and What was the mean ranking for the females in this class
The amount of time ships spend at the Philadelphia dockyard follows an exponential distribution and the average time spent in the dockyard is 3.1 days.
Scores are obtained from the Law School Admission Test (LSAT) are normally distributed with a mean score of 550 and a standard deviation of 110.
Assume you want to repeat the FDA experiment to achieve an estimation of the mean μ of the amount of caffeine content of a cup of coffee.
How many ounces should they advertise on the box if they want to be sure that no more than 0.5% of the boxes are filled less than that advertised amount?
There are two car dealerships in a particular region. The mean monthly sales at the two dealerships are about the same. Though, one of the dealerships (dealership A) is boasting to corporate headquarters that his dealership's monthly sales are mor..
For a binomial probability experiment, with n=150 and p=.2, it is appropriate to use the normal approximation to the binomial distribution.
Evaluate the difference in the mean ratings and find the standard deviation of the difference in the ratings, what is the chance both children are boys?
Discuss which analysis of variance should be applied when an experiment has more than one independent variable. Discuss the assumptions and limitations of the analysis of variance in comparison with the t test including a discussion of post hoc te..
Explain why random samples are preferred to nonrandom samples.
Find out the probability that the return for common stocks will be more than 0%.
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