19.

The mean throwing distance of a football for a Marco, a high school freshman

quarterback, is 40 yards, with a standard deviation of two yards. The team coach tells

Marco to adjust his grip to get more distance. The coach records the distances for 20

throws. For the 20 throws, Marco's mean distance was 45 yards. The coach thought the

different grip helped Marco throw farther than 40 yards. Test the coach's claim at

=

0.05. Assume the throw distances for footballs are normal.

Discussion Questions:

True/False

: A hypothesis test can definitively determine whether a claim is true or false.

True/False

: T

he "hypothesis" in hypothesis testing refe

rs to the original claim

(we are

always assuming the original claim is true)

.

True/False

:

When performing a hypothesis test, t

he null hypothesis is the assu

mption of

no effectchange.

Nothing unusual has happened.

True/False

: It is possible to support

the original claim if the original claim corresponds to

the null hypothesis.