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Constructing a Confidence Interval:
You randomly select 20 cars of the same model that were sold at a car dealership and determine the number of days each car sat on the dealership's lot before it was sold. The sample mean is 9.75 days, with a sample standard deviation of 2.39 days. Construct a 99% confidence interval for the population mean number of days the car model sits on the dealership's lot. Assume the days on the lot are normally distributed.
Recently there has been quite a bit of controversy about the lack of definitive knowledge about the adverse side effects associated with hormone based birth control usage. Suppose a researcher is interested in the effects of birth control in wome..
The results were roughly bell-shaped with a mean of $35 and standard deviation of $10. Find the margin of error at a 98% confidence level.
Does this situation meet the binomial requirements? Why or why not? Address the five conditions of a binomial distribution in the textbook.
in a poll conducted by the nanos research on may 1 2011 38.7 of n 702 decided voters supported the conservative.a find
Two t-curves have degrees of freedom 12 and 20, respectively. Which one more closely resembles the standard normal curve? Explain your answer.
The experimenters observed how many days the patients stayed in the hospital and compared the two groups. The experiment ran for two months.
The heights of 18 year old men are approximately normally distributed with mean 68 inches and a SD of 3 inches.
Minorities the NAACP claimed that in Volusia County, Florida, police stopped dark-skinned drivers on I-95 who were not violating the law much more frequently.
a. Define variables that would tell how many units to purchase from each source. b. Develop an objective function that would minimize the total cost.
a. What is the standard deviation of demand during the lead time? b. How much safety stock should be carried, and what should be the reorder point?
a 90 confidence interval for a proportion is 0.265 0.385. what is the probability that the population proportion is
indicate whether each statement refers to a uniformly distributed variable normally distributed variable andor an
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