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August 27, 2015

Homework Help: Statistics

Posted by Lindy on Friday, May 2, 2008 at 12:43pm.

The head librarian claims that books have been checked out an average of seven times in the last year.

You suspect she has exaggerated the checkout rate and that the mean number of checkouts per book per year is, in fact, less than seven.

Using the computerized card catalog, you randomly select one book and find that it has been checked out four times in the last year. Assume that the standard deviation of the number of checkouts per book per year is approximately 0.90.

If the mean number of checkouts per book per year is seven, as the librarian claims, would you consider a value of 4 checkouts per year to be an outlier?

Is the x value of interest more than 3 standard deviations below the mean or is it 3 st deviations above the mean?

Or is the x-value not an outlier?

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