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The states you have identied lie close together on the plot. To see if they are inuential as a group, find the regression line with all of these states removed from the calculation. Draw this new line on your plot. Was this group of states inuential?
(a) What is the relative frequency (i.e., proportion) of observations falling in the 0.260-0.280 interval? (Give your answer to four decimal places.) (b) What is the shape of the data distribution?
In this group four were African American, 6 were hispanic, and one was Asian. Was this a good sample on which to norm this test? why or why not? What are your suggestions?
Computation of Expectation, Variance and Covariance.Calculate the variances of Y1 and Y2.
A regional director responsible for business development in the state of pennsylvania is cocerned about the number of small business failures. If the mean of small businsses failures per month is 10,
Many newspapers, when reporting results of political polls, say that 'with 95% confidence, the results are in error by no more than ±3 percentage points'.
Give an example of two variables that probably have a significant linear correlation coefficient, but one variable does not necessarily cause the other.
An investor estimates that there is a 1 in 10 chance that a stock purchase will lose 20% of its value, a 2 in 10 chance it will break even, a 4 in 10 chance it will gain 15% and 3 in 10 chance it will gain 30%. What is the expected return.
Can the company claim that they are faster than the average utility?
Find the probability that out of our batch of 100, with the sampling technique listed above, that (i) both toothbrushes are defective, (ii) that one of the two is defective.
Compute a 95% confidence interval for the population mean, based on the sample 25, 27, 23, 24, 25, 24 and 59. Change the number from 59 to 24 and recalculate the confidence interval.
Compute the 3.9% confidence interval on the mean. Which confidence interval is more practical and useful in a business situation? Why?
The total profit (in dollars) for sales of x rowing machines is given by P(x) = -0.2x^2 + 300x - 200. What is the profit if 500 are sold? For what value of x will the profit be at a maximum?
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