Performance comparing

A standardized test was administered to thousands of students with a mean score of 85 and a standard deviation of 8. A random sample of 50 students was given the same test and showed an average score of 83.20. Is there evidence to show that this group has a lower performance than the ones in general at a 0.05 level?



Step-by-step explanation:

m=85 s=8  n2=50 m2=83.20  α=0.05  Z=N(0,1) z=s/n2m2m=8/5083.2851.591  p=P(Z<z)  p=0.0559  α<p x=0

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