Asked by Harman Grewal on May 29, 2024

Verified

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) ${\mathrm{H}}_0$ : ? = 135 ${\mathrm{H}}_{\mathrm{A}}$ : ? > 135
B) ${\mathrm{H}}_0$ : ? = 120 ${\mathrm{H}}_{\mathrm{A}}$ : ? > 120
C) ${\mathrm{H}}_0$ : ? = 120 ${\mathrm{H}}_{\mathrm{A}}$ : ? ? 120
D) ${\mathrm{H}}_0$ : ? = 120 ${\mathrm{H}}_{\mathrm{A}}$ : ? < 120
E) ${\mathrm{H}}_0$ : ? = 135 ${\mathrm{H}}_{\mathrm{A}}$ : ? ? 135