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The president of an agency specializing in public opinion surveys claims that approximately 70% of all people to whom the agency sends questionnaires responds by filling out an returning the questionnaire. Four such questionnaires are sent out. Let r be the number of questionnaires that are filled out and returned.
What is the probability that exactly three questionnaires are filled out and returned?What is the probability that at least three questionnaires are filled out and returned?What is the probability that no questionnaires are filled out and returned?
In the real world, given null hypothesis is false; but the collected data lead to the null hypothesis being accepted. That is, the data lead to a failure to reject null hypothesis.
Construct a 90% confidence interval on the difference in fraction nonconforming between the two processes."
Make an Excel line graph of the data on computer viruses. Discuss the underlying causes that might explain the trend or pattern.
The national average SAT score (for Verbal and Math) is 1028. If we assume a normal distribution with σ = 92, what is the 90th percentile score? What is the probability that a randomly selected score exceeds 1200?
Suppose a firm evaluates the productivity of the three shifts of workers who work in their factory. Each shift's performance is measured based on the amount of output that is produced during the shift - day, evening, or swing shift.
If they must form an ethics subcommittee of 4 members, how many different subcommittees are possible?
She then selects a sample of 102 football players and finds that their average math SAT is 460. Use alpha =.01 to perform the appropriate hypothesis test.
How large a sample size will need to be selected if we wish to have a 99% confidence interval with a margin for error of .10 oz?
Given a normal distribution of data, we know from the Empirical Rule that in between 2 standard deviations from the mean
List all corner points and determine which combination of items will produce the maximum profit.
Determine a 95 % confidence interval for the iron concentration.
The value of R-square indicates the amounts of variation in the dependent variable that is explained by the independent variable.
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