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An IQ test is designed so that the mean is 100 and the standard deviation is 20 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 95?% confidence that the sample mean is within 5 IQ points of the true mean. Assume that sigmasequals=20 and determine the required sample size using technology. Then determine if this is a reasonable sample size for a real world calculation.
A programmer plans to develop a new software system. In planning for the operating system that he will? use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be 90?% confident that his estimate is in error by no more than four percentage points question mark s? Complete parts? (a) through? (c) below.
?a) Assume that nothing is known about the percentage of computers with new operating systems.
(Round up to