A manufacturer claims that the mean lifetime of its lithium

A manufacturer claims that the mean lifetime of its lithium batteries is 1200 hours. A homeowner selects 25 of these batteries and finds the mean lifetime to be 1180 hours with a standard deviation of 80 hours. Test the manufacturer\'s claim. Use = 0.05.

P-Value = ________

Decision = ________

Please show the steps using a TI - 83 calculator. Thanks

Solution

Go to

[STAT][TESTS][T-Test][Stats]

Input:

uo = 1200
xbar = 1180
s = 80
n = 25

Select u =/= uo

Press ENTER.

DONE!

***************

So,

P value = 0.223351478

Decision: As P > 0.05, WE FAIL TO REJECT THE NULL HYPOTHESIS. [ANSWER]