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Suppose we have observations x1, x2, . . . , xn. Prove that the sum of deviations of the observations from their arithmetic mean is always equal to zero.
What is the proportion of people surveyed that rated the subway system from 3 to 4. What is the proportion of people surveyed rated the Subway System from 1 to 3.
Is there evidence that teams with higher total payrolls tend to be more successful? Justify your answer.
You may assume the sample data comes from a population that follows a normal distribution. Using a .05 level of significance test the company's claim.
Following is based on information from Statistical abstract of the United States, Dec, 1992. Are A and B mutually exclusive?
The error between the sample mean and the population mean for a sample of n = 16 is 5 points and the error between a sample men and population mean for a sample of n = 100 is 2 points. Explain the difference in the standard error for the two sampl..
When coaching or training athletes, the tests employed to predict performance or determine training methods incorporate statistical methods. Why are these methods so effective?
Determine the coefficient of correlation between the two variables. Interpret the value.
For one of the first statistics exam, the coefficient of determination between hours studied and the grade earned was 80 percent. The standard error of estimate was 10.
The goal is to get people thinking about how they can actually use correlation and regression in their real life, and where and how can they can really benefit from these techniques?
Category of decision rule which contains maximax decision rule is?
A box contains four tickets, one marked with a star and the other three blank. One draw is made from this box at random.
A survey found that 85% of women in a given city enjoy shopping online. Suppose you randomly selected 6 women from the city and ask them whether or not they enjoy shopping online. Find the probability that exactly 4 say they enjoy shopping online.
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