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27-12-2022
Business

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A company offering online speed reading courses claims that students who take their courses show a 5 times (500%) increase in the number of words they can read in a minute without losing comprehension. A random sample of 100 students yielded an average increase of 415% with a standard deviation of 220%. Calculate a 95% confidence interval for the average increase in number of words students can read in a minute without losing comprehension. Choose the closest answer
a) (411.37, 418.63)
b) (371.88, 458.12)
c) (412.09, 417.91)
d) (378.7, 451.3)

Answer :

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