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1) An educational psychologist wishes to know the mean number of words a third grader can...

1) An educational psychologist wishes to know the mean number of words a third grader can read per minute. She wants to make an estimate at the 98% level of confidence. For a sample of 1434 third graders, the mean words per minute read was 25.9. Assume a population standard deviation of 3.5. Construct the confidence interval for the mean number of words a third grader can read per minute. Round your answers to one decimal place.

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Answer #1

25.9   2.326 ( 3.5 / 1434 )

25.9   0.2150

( 25.7 , 26.1 )

A 98 % CI for population mean is ( 25.7 , 26.1 )

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