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Normal and Sampling Distributions
Q1.The life of cell batteries is normally distributed with a mean of 88.2 hours and a standard deviation of 15.5 hours. 93% of the batteries will last more than how many hours? (2 decimal places )
Q2.The length of time for long-distance phone calls has been found to be normally distributed, with a mean of 23.2 minutes and a standard deviation of 6.7 minutes. In a randomly selected sample of 59 calls, what is the sample average call time below which 10% of sample average call times will be shorter?
How does our Eurocentric understanding of global history relegate the vast majority of human history as peripheral?
How have statistics been used inappropriately and what are some examples of when you have seen or heard statistics used inappropriately?
In a large population of college-educated adults, the mean IQ is 118 with a standard deviation of 20. What is the probability that a randomly selected adult from this population has an IQ that is greater than 120?
She gathers a sample of 35 subjects with depression and obtains a sample mean of 7.82 micrograms/100 ml. What are the null and alternative hypotheses for this study?
question according to the statistical abstract of the united states there are 31.1 milshylions one-person households
a manufacturer of precision measuring instruments claims that the standard deviation in the use of the instruments is
a poll was conducted that asked 1015 people how many books they had read in the past year. x13.3 books and s16.6 books
The number of customers for a randomly selected week was collected. Should the vice president consider closing any of the stores based on daily patronage? Does a certain day of the week have any effect on the average number of customers
in 2006 merck released a vaccine named gardasil for hpv - the most common cause of cervical cancer among young women.
Train A and Train B are two transportations that people can use to transport from Boston to New York - From above computed results from Train A and Train B, what train should be preferred and why?
She knows that each order for these bills costs $300 for clerical and armored car delivery costs, and that order lead time is six days. Assuming a thirty-day month, if she were to order 6,000 bills at a time, what would be the length of an order cy..
For the 20 test scores shown, find the percentile rank for a score of 86.
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