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An employee survey conducted two years ago Packard Motors Inc. found that 53% of its employees were concerned about future health care benets. A random sample of 80 of these employees were asked if they were concerned about the future health care benets. Answer the following assuming that there has been no change in the level of concern about the health care benets compared to the survey two years ago.
a) What is the standard error of the sample proportion who are concerned?
b)What is the probability that the sample proportion is less than 0.5?
c)What is the upper limit of the sample proportion such that only 3%of the time the sample proportion would exceed this value
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