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Average daily temperatures in January and July for 60 large U.S. cities are graphed in the histograms below.
a) What aspect of these histograms makes it difficult to compare the distributions?
b) What differences do you see between the distributions of January and July average temperatures?
c) Differences in temperatures (July - January) for each of the cities are displayed in the boxplot above. Write a few sentences describing what you see.
In a random sample of 150 sports cars, 60 failed emissions on the first pass. Is there sufficient evidence to indicate that the percentage of first failure for sports cars is higher than the percentage for all passenger cars?
In a large western university, 15% of the students are graduate students. If a random sample of 20 students is selected, what is the probability that the sample contains:
In a race of 10 sailboats, the finishing times of all boats are iid Gaussian random variables with expected value 35 minutes and standard deviation 5 minutes.
in 1990 the mean height of women 20 years old age or older was 63.7 inches with a standard deviation of 2.1 inches
What is the t-test statistic? Top Shelf Sales Volume 23 35 50 68 32 Bottom Shelf Sales Volume 55 70 72 51 63
That way you will have evidence to present to the director if you implement the cut in hours. Test the claim that there is no difference at the .01 significance level. Can you implement your staffing changes?
If you sample 100 oranges and find that sample mean weight to be 3.7 oz, would you doubt the statement that the orange comes from the population with mean weight of 4.0 oz and standard deviation of 1.0 oz? Justify your answer.
The mean height of a certain kind of plant is 128 centimeters. Suppose we want to carry out a hypothesis test to see if the mean height when these plants are treated with a certain chemical differs from 128.
Should you expect to win or loose the expected value in the first game? What can you expect if you play 100 times? Explain (a table will be helpful in finding the required probabilities).
The following regression line shows how the monthly return for the mutual fund TWCUX (Twentieth Century Ultra Fund) is mathematically related to the S&P500 monthly return.
barrons conducts an annual review of online brokers including both brokers who can be accessed via a web browser as
please answer the question in full provide any equations or diagrams used to come to your final answer.in the board
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