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The Labor Bureau wants to estimate, at a 98% confidence level, the proportion of all households that receive welfare. The sample size that would limit the maximum error of estimate to within .07 of the population proportion is at least:
a) 1091
b) 17
c) 845
d) 277
a researcher is considering using 90 confidence interval for his research project instead of 95. what happens to the
A researcher conducts an experiment comparing two treatment conditions and obtains data with 10 scores for each treatment condition.
What is a test of a proportion and give an example. What test do you use when one sample is small and the other large?
Considering that the probability of event C is .44, of event D is .20, and the probability of their intersection is .088, determine whether C and D are dependent or independent events.
Given that a Brand A battery just failed, what is the expected value of the time we wait until the next Brand B failure?"
Sstandart deviation of 40 seconds. Find the probability that a randomly selected boy in secondary school can run the mile in less than 368 seconds.
1.a recent study investigated the extent to which hypertension is affected by alcohol consumption. among other things
a random sample of 70 printers discovered that 30 of them were being used in small businesses. find the 95 confidence
State the direction of the alternative hypothesis used to test that the demand function is downward sloping. Type gt (greater than), ge (greater than or equal to), lt (less than), le (less than or equal to) or ne (not equal to) as appropriate in the ..
If you have a normal distribution of a random variable x, with a mean of 56 and standard deviation of 8: What is the probability that the random variable x will be within plus or minus 1 standard deviation of the mean?
assume you are presented with the following mutually exclusive investments whose expected net cash flows are as
Use your calculator to find the mean and standard deviation for the 9 observations that remain when you leave out the outlier. How does the outlier affect the values of x and s? Is s a resistant measure of spread?
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