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Of the bolts manufactured for a certain application, 90% meet the length specification and can be used immediately, 6% are too long and can be used after being cut, and 4% are too short and must be scrapped.
(a) Find the probability that a randomly selected bolt can be used (either immediately or after being cut).
(b) Find the probability that fewer than 15 out of 20 bolts can be used.
(c) Find the probability that more than 12 but fewer than 18 out of 20 bolts can be used.
(d) How many bolts are expected to be used out of 50 bolts.
Describe how a domestic fast food chain with plans for expanding into China would be able to use a forecasting model.
Calculate the average or the median of the average or medians of the samples and compare it with the average of the population.
What internal and external threats are and could you provide some examples of what would be considered a threat to internal and/or external validity of a study design.
A linear regression between Y and X produced the following equation for the least squares line:
A pharmaceutical company is testing the effectiveness of a new drug for lowering cholesterol. As part of this trial they wish to determine whether there is a difference between the effectiveness for women and for men. At a=5, what is the test valu..
What is the five step process for hypothesis testing? Why or why not? What is the null hypothesis? Why is it important? What are its implications? Explain. You may use examples to show your understanding.
For each of the following studies, say whether you would use a t test for dependent means or a t test for independent means.
What is the probability that of today's 1,000 callers at least 5 received a busy signal? Use the poisson approximation to the binomial. (Round your answer to 4 decimal places.)
Find the t c for a 90% confidence level with a sample size of 18.
Suppose that among workers exposed to asbestos in a shipyard in 1980, 33 died over a 10-year period from COPD, whereas only 24 such deaths would be expected based on statewide mortality rates. Is the number of deaths from COPD in this group excess..
Using a previous exercise about Hallux abducto valgus (HAV) (deformation of the big toe that often requires surgery). Doctors used x-rays to measure the angle (in degrees) of deformity in 38 consecutive patients under the age 21 who came to a medi..
You are conducting a study for which it is critical that the findings be representative of the population of interest. Which of the following research methods runs the greatest risk.
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