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Suppose you want to estimate the proportion of traditional college on your campus who own their own car. Based on some research on other campuses, you believe the proportion will be near 25%. What sample size is needed if you wish to be 90% confident that your estimate is within 3% of the true proportion (e.g. that your MOE is 0.03).
the length of country and western songs is normally distributed and has a mean of 170 seconds and a standard deviation
(a) Find the maximum likelihood estimate for ii based on a sample of size n. (b) Use B to find an estimate for the mean value of X. Is this estimator unbiased
Where do you get your news? A Pew Research Center survey asked people about their main source for national and international news.
What happens to the confidence interval and the power of the test at a particular point of interest. As one increases the sample size of a test, all else remaining the same.
Suppose a sample of farmers is to be selected for estimating the cost of cultivation of maize per hectare. The precision is to be within 20 birr with 95% confidence level.
Suppose there are three earthquakes of magnitude 8 or higher. Is there any evidence to suggest that the mean is different from one? Justify your answer
The following table gives the number of pints of A blood used at Damascus Hospital in the past? 6? weeks:
1) During the period of time that a local university takes phone-in registrations, calls come in at the rate of one every two minutes.
bar code 39 code 39 is a common bar code system that consists of narrow and wide barsblack separated by either wide or
Does the variability in output appear to differ at the two experience levels? Test the hypotheses at the .05 significance level.
a) How much more cereal do you expect to be in the large bowl? b) What's the standard deviation of this difference?
Compute chi-square and test that the proportion of smokers is the same among cases and controls for (a) and (b). Is the chi-square the same if the number of controls is doubled?
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