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The company decides to reject barometers that read more than 1.5 standard deviations above or below the mean. What is the critical reading below the barometers will be rejected.
Explain the importance of random sampling. What problems/limitations could prevent a truly random sampling and how can they be prevented?
The population are shorter than 66 inches, what is the probability a randomly selected member of this population is between 66 and 76 inches tall?
your manager who just read an abridged version of a statistics book wants you to test hypotheses for the difference in
The probability that merchandise stolen from a store will be recovered is 15%. Suppose a random sample of 8 stores, from which merchandise has been stolen, is chosen. Find the mean μ of this probability distribution.
two separate samples each with n12 individuals receive two different treatments. after treatment the first sample has
What are the possible values of the stock after two days, and what is the probability for each value? What is the probability that the stock is worth more.
Calculate the probability that the median of the sample or average medians is:
E A nutritionist wants to understand the influence of income and healthy food on the incidence of smoking. He collects 2009 data on the percentage of smokers.
a survey of 25 randomly selected customers found the ages shown in years. 28 36 40 26 33 24 11 47 23 33 46 38 35 14 33
What is the probability that a randomly-selected truck travels between 30 and 60 thousand kilometres in one year. Standard deviation of 12.0 thousand kilometres.
Assume that this percentage is based on a random sample of 800 French people. Give a 95% confidence interval for the population proportion in France.
i. how many strings of ten digits length can be formed using only the digits 12345? digits may be used more than once
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