Assume that the sample is a simple random sample obtained from a normally distri

Question

Assume that the sample is a simple random sample obtained from a normally distributed population of IQ scores of statistics professors. Use the table below to find the minimum sample size needed to be 95% confident that the sample standard deviation s is within 2 % of. s this sample size practica To be 95% confident that s s within l 1% 5% 10% 20% 30% 40% | 50% f the value of ? the sample size n |1920s 768 | 192 | 48 | 21 hould be at least o be 99% confident that s is within | 1% | 5% | 10% | 20% | 30% | 40% | 50% of the value of ?, the sample Size n should be at least 321aj,336| 336 | 85 38 The minimum sample size needed is Is this sample size practical? O A. No, because the sample size should be as small as possible for most applications O B. No, because the sample size is excessively large to be practical for most applications. ° C. Yes, because the sample size is small enough to be practical for most applications. O D. Yes, because the sample size should be as large as possible for most applications

Explanation / Answer

Under the column of 20% in second row we have the minimum sample size required as 48.

Yes the sample size is practical as 48>30.

Option D is correct

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