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Question: The mean score on a standardized test is 100 with a standard deviation of 8. A random sample of 48 scores was found to have a mean of 98. Find the standard error.


A ) 1.15
B ) 0.8
C ) 8.0
D ) 1.0

Steps to derive

1 σe= σn, where σ is the standard deviation of the population and n is the number of elements in the sample
 [Use Standard error formula.]

2 σe= 848≈ 1.15
 [Replace σ = 8, n = 48.]



Hence the right answer is Option A

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