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Survey was mailed to a total of 400 students; 100 were randomly selected from each of the freshman, sophomore, junior and senior classes last semester. What sampling method was used?
The point estimate for the difference between the proportions is:
A bank official reported the results of a regression analysis designed to predict the bank's charges (y), measured in dollars per month, for services rendered to local companies.
A professor is targeting a score of 80 on an exam. His forty-nine students averaged 78 on an exam with s = 7. Are the scores significantly less than 80 at a significance level of 0.05? Show your work and state the conclusion.
You calculate that their mean monthly rent is $613 and their standard deviation is $96. What are the degrees of freedom for a one-sample -statistic?
Find the regression equation and percentage of variance and test whether the equation is significant portion of the variance.
If one NBA player is selected at random, find the probability that this player is either 7 feet tall or weighs over 200 pounds.
Does the overall data support the mayor's claim?
Identify the independent and dependent variables. Indicate the number of levels in the independent variable and describe each level.
Make a histogram showing the probabilties of r = 0, 1, 2, 3, 4, 5, 6, 7 or 8 defective syringes in a random sample of 8 syringes.
Determine the event that the sum of the numbers falling uppermost is less than or equal to 7
Service A delivers the document with probability 0.9, Service B with probability 0.9 and Service C with probability 0.8. What is the probability that at least one copy of the document will be delivered on time?
Using the results, describe the effect of an outlier or extreme value on the confidence interval.
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