Question: Two gel pens, Gel-1 and Gel-2, are compared on the basis of the number of weeks before they stop writing. Out of 27 persons available,

Two gel pens, Gel-1 and Gel-2, are compared on the basis of the number of weeks before they stop writing. Out of 27 persons available, 13 are randomly chosen to receive Gel-1 and the other 14 receive Gel-2. These are the only pens they use for writing.

(a) Obtains s2pooled.
(b) Test H0: Î¼1 = Î¼2 against H1: Î¼1 > Î¼2 with Î± = .05.
(c) Determine a 95% confidence interval for Î¼1 - Î¼2.

n! = 13, x = 19, (xi-x)"-28

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