Question

A manufacturer claims that the mean lifetime of its lithium batteries is less than 1120 hours. A homeowner selects 25 of these batteries and finds the mean lifetime to be 1100 hours with a

standard deviation of 75 hours. Test the manufacturer's claim. Use α = 0.01.

A. P-value = 0.110 > 0.01; do not reject H0; There is not enough evidence support the claim, that mean is less than 1120.

B. P-value = 0.097 > 0.01; do not reject H0; There is not enough evidence support the claim, that mean is less than 1120.

C. P-value = 0.097 < 0.05; reject H0; There is enough evidence support the claim, that mean is less than 1120.

D. P-value = 0.112 > 0.05; do not reject H0; There is not enough evidence support the claim, that mean is less than 1120.

Answer #1

A manufacturer claims that the mean lifetime of its lithium
batteries is less than 1500 hours. A homeowner selects 25 of these
batteries and finds the mean lifetime to be 1480 hours with a
standard deviation of 80 hours. Test the manufacturer's claim.
Use α = 0.10.
A.
P-value = 0.112 > 0.10; do not reject H0; There is not enough
evidence support the claim, that mean is less than 1500.
B.
P-value = 0.112 > 0.05; do not reject...

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1. A manufacturer claims that the mean lifetime of its
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