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 40% of Is this sample size practical? o be 95% confident that s is within l 1% | 5% | 10% | 20% | 30% | 40% | 50% of the value of , the sample size n |19.209768| 192| 48 | 21 | 12 | should 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 |3321336|336| 85 | 38 | 22 | 14 should be at least 8 The minimum sample size needed is Is this sample size practical? O A. Yes, because the sample size is small enough to be practical for most applications O B. No, because the sample size should be as small as possible for most applications. ° C. No, because the sample size is excessively large to be practical for most applications. 0 D. Yes, because the sample size should be as large as possible for most applications. Click to select your answer(s)

Explanation / Answer

Given within the Sd = 40% of Sigma and alpha = 5%

From the given data
The minimum sample size need is 12

Correct Answer: Option A

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