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an IQ test is designed so that the mean is 100 ponts and the standard decistion...

an IQ test is designed so that the mean is 100 ponts and the standard decistion is 12 ponys. find the sample size necessary to estimate the mean of statistic stufents such that it can be said with 90% confidence ( za/2= 1.645) that the sample mean is within 7 IQ points (e=7) of u, it the true mean.

the required sample size is?
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Answer #1

Sample size = Z2​​​​ ​​/2 * / E2

= 1.6452 * 122 / 72

= 7.85

Sample size = 8 (Rounded up to nearest integer)

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