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On average, a textbook author makes two word processing errors per page on the first draft of her textbook. What is the probability that on the next page she will make
A large chain retailer purchases a certain kind of electronic device from a manufacturer. The manufacturer indicates that the defective rate of the device is 3%.
Describe the characteristics of the F distribution. Provide examples. What are we testing when we test for two population variances? Explain your answer and provide an example.
The average time waster per week for 10 weeks was 4.1 hours with a standard deviation of 1.33 hours. If a hypothesis test was performed at the .01 level with an assumption of a normally distributed
Eleven patients were weighed before and after a diet which was designed to help patients reduce weight. Eight of these patients did lose weight but three patients had a weight increase.
Eight of these patients did lose weight but three patients had a weight increase.To test whether the diet is successful (i.e., post weight is lower than pre-weight) using post weight-pre-weight, sta
The prevalence of a health condition is the existing number of cases of that condition in the population. State whether the factors listed below are likely to increase or decrease the prevalence of
Calculate the appropriate disease frequency rate. Show your work. The cumulative incidence rate in a population of 100,000 people where 9 new cases of disease were reported within 1 year.
Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15. Find the probability that a randomly selected adult has an IQ less than 124.
The lifetime of one of DotCom's electronic equipment has a mean of 400 hours and standard deviation of 400 hours. They have been assuming lifetime is normally distributed. What is the probability th
Suppose certain coins have weights that are normally distributed with a mean od 5.492 g and a standard deviation of 0.062 g. A vending machine is configured to accept those coins with weights betwe
Your client is considering two investments and has asked you to evaluate these alternatives. Provide financial and risk advice for your client regarding which to purchase.
For each of the following scenarios, indicate which type of statistical error could have been made and (where additional information is needed) specifically what would need to have happened for said
A company purchases shipments of machine components and uses this acceptance sampling plan: Randomly select and test 20 components and accept the whole batch if there are fewer than 3 defectives.
If a particular shipment of thousands of components actually has a 8% rate of defects, what is the probability that this whole shipment will be accepted? Round to three decimal places.
The sample yielded a mean score of 53. Test the hypothesis that the training program has a significant effect on mechanical aptitude score. What is the standard error of the mean for this sample?
To estimate an unknown mean , we take a random sample of size 49 , and we calculate Y-bar . What is an approximate 95% bound on epsilon?
Intelligence tests are designed to provide a normal distribution of IQ scores with a mean of 100 and a standard deviation of 15.
The lengths of full-grown emerald tree boas from the Amazon River Basin are known to be normally distributed with a mean of 7.6 feet and a standard deviation of 0.45 feet. What is the probability th
Suppose that there are a total of 18 students in an elementary school class. The teacher assigns each of the students a report on a mainland country in either North America or South America (not inc
A proposal has been presented to the government of Newfoundland and Labrador to build a new section of highway that would provide improved access for residents of a remote coastal area near Bonavist
The R.R. Bowker company collects information on the retail prices of books and publishes the data in the Bowker annua libray and book and trade almanac. In 2005, the mean retail of agriculture books
Automobiles arrive at the drive-thru window at the downtown Fort McMurray post office at the rate of 4 every 10 minutes. The average service time is 2 minutes. The Poisson distribution is appropriat