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E-mail. A small company involved in e-commerce is interested in statistics concerning the use of e-mail. A poll found that 38% of a random sample of 1012 adults, who use a computer at their home, work, or school, said that they do not send or receive e-mail.
a) Find the margin of error for this poll if we want 90% confidence in our estimate of the percent of American adults who do not use e-mail.
b) Explain what that margin of error means.
c) If we want to be 99% confident, will the margin of error be larger or smaller? Explain.
d) Find that margin of error.
e) In general, if all other aspects of the situation remain the same, will smaller margins of error involve greater or less confidence in the interval?
Suppose the mean time that was observed for the sample last month was 4 hours 44 minutes (284 minutes). What is the probability of seeing a sample mean this high or higher?
Typically, these children must have IQ scores in the top 5%. What is the minimum score to qualify a child for these programs?
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The quality control manager for ENTA Inc. must decide whether to accept (a1), further analyze (a2) or reject (a3) a lot of incoming material. Assume the following payoff table is available.
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Using the array in question 1 above, calculate the arithmetic mean with the single most extreme outlier removed. Round the calculation to two decimal places.
Psychologists wanted to test whether a certain accelerated class' IQ was different than average. There were 25 students in the class; their mean IQ score was 108.
question 1current weekly demand forecast for an item follows a normal distribution with a mean of 100 units with a
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