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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?
What is the 95% confidence interval for the proportion of all delinquent customer accounts at this manufacturing company?
Now we would like to evaluate regression equation for X using Y as independent variable.
Two groups of students are asked to rank their preference for six types of soft drinks. The following table shows their rankings.
An extended-life light bulb claims the bulb has an average life of 12,000 hours, with a standard deviation of 500 hours. If the distribution is bell shaped and symmetrical
A film developer claims that the mean number of pictures developed for a camera with 24 exposer is less than 22. If the hypothesis test is preformed, how should you interpret a decision a)reject the null hypothesis and b) fail to reject the null h..
What is the probability of winning if the rules are changed so that in addition to selecting the correct five numbers, you must now select them in the same order they are drawn?
An article reports that when each football helmet in a random sample of 44 suspension-type helmets was subjected to a certain impact test, 25 showed damage.
As part of its testing program, LongLast tests a sample of 25 batteries. What is the standard error of the mean?
An automobile insurance company estimates the following loss probabilities for the next year on a $25,000 sports car:
As a manager of an organization, what statistics would you use and why if you wanted to estimate your annual employee turnover? Be sure to specifically identify the statistical formulas and what additional data you would need to determine your est..
Assume the data have bell shaped distribution with a mean of 30 and a standard deviation of 5. Employ the empirical rule to determine the percentage of data within each of the following ranges: 20 to 40, 15 to 45, and 25 to 35.
This requires you evaluate the data (on the next sheet) and apply Queueing Theory to determine the characteristics of the queues. Please refer to the concept on Queuing Theory for the procedures to do.
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