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The mayor of a small town would like to know whether a local bond issue is likely to pass or not. He mails a survey to 500 randomly selected voters. How many returns must he get in order to know the proportion that will support the bond issue within a standard error of 5% and a confidence level of 95%? If he gets a 60% return from the mailing and would like to keep the error at 5%, what will happen to his confidence in the result? If he gets a 60% return from the mailing and would like to maintain his 95% confidence in the result, what will happen to the error?
(a) Consider a normal distribution with mean μ = 88. If 2% of the values lie below x = 50, find the standard deviation σ. (b) Consider a normal distribution with standard deviation σ = 15.6. If 10% of the values lie above x = 17.2, find the mean μ.
Plot the control limits for the mean outside diameter and the range.
Could mud-wrestling be the cause of a rash contracted by University of Washington students in the spring of 1992? Two physicians at the University of Washington health center wondered this when one male and six female students complained of rashes..
The incubation time for Rhode Island Red chicks is normally distributed with a mean of 21 days and standard deviation of approximately 1 day.
test null hypothesis: Meu=80 against alternative hpothesis=negative = 80 (alpha =.05). What does this tell you about meu?
Find the relative risk for moderate beer drinkers as compared to nondrinkers, finds the 95% confidence interval
An urn contains 8 green balls, 5 red balls, and 7 white balls. How many ways are there to draw a green ball or a red ball?
Do the confidence interval limits contain 98.6F? What does the sample suggest about the use of 98.6F as the mean body temp.
Using the 0.10 level of significance, is there evidence that the population mean is above $300?
The estimated miles per gallon ratings of a class of automobiles are normally distributed with a mean of 12.8 and a standard deviation of 3.2. What is the probability that one of these automobiles selected at random would get:
What is the probability that the cereal would be high calorie? In other words, what is P (high calorie)?
Is there significant evidence that this production run doesn't meet specifications? Use a 1% level of significance.
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