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Write the null and alternative hypotheses.

You want to see if the number of minutes cell phone users use each month has changed from its mean of 120 minutes 2 years ago. You take a random sample of 100 cell phone users and find an average of 135 minutes used.

A. H0: μ = 135
HA: μ > 135
B. H0: μ = 120
HA: μ < 120
C. H0: μ = 120
HA: μ ≠ 120
D. H0: μ = 120
HA: μ > 120
E. H0: μ = 135
HA: μ ≠ 135

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