1. An IQ test is designed so that the mean is 100 and the standard deviation is 23 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of statistics...


1.


An IQ test is designed so that the mean is 100 and the standard deviation is
23for 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
90​%
confidence that the sample mean is within
5
IQ points of the true mean. Assume that
sigmaσequals=23
and determine the required sample size using technology. Then determine if this is a reasonable sample size for a real world calculation.


The required sample size is​(Round up to the nearest​ integer.)


2.The pulse rates of
171
randomly selected adult males vary from a low of 42
bpm to a high of
110
bpm. Find the minimum sample size required to estimate the mean pulse rate of adult males. Assume that we want
959%

confidence that the sample mean is within
2
bpm of the population mean


Find the sample size using the range rule of thumb to estimate
σ


n=




Jun 01, 2022
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