The national assessment of educational progress (naep) gave a test of basic arithmetic and the ability to apply it in everyday l
ife to a sample of 840 men 21 to 25 years of age. scores range from 0 to 500; for example, someone with a score of 325 can determine the price of a meal from a menu. the mean score for these 840 young men was x¯¯¯x¯ = 272. we want to estimate the mean score μμ in the population of all young men. consider the naep sample as an srs from a normal population with standard deviation σσ = 60.
<span>Ans : a)
What is the standard deviation of this sampling distribution?
Ď /âšn
= 60/âš840
=2.0702
b)
1 standard deviation of the mean
= (1) 2.07
= 2.07
c)
272+/- 1(2.07)
(269.93, 274.07)</span>
