The average monthly cell phone bill was reported to be $\$ 50.07$ by the U.S. Wireless Indus Random Sampling of a large cell phone company found the following monthly cell phone (in dollars):
$\begin{array}{llll}
\hline 52.62 & 46.27 & 59.77 & 67.21 \
57.26 & 49.24 & 45.99 & 46.81 \
55.39 & 48.08 & & \
\hline
\end{array}$

At the $0.05$ level of significance, can it be concluded that the average phone bill has incre ry. reased?
A) No. There is not enough evidence to support the claim that the average bill has increased from $50.07.
B) There is not enough information to draw a conclusion.
C) Yes. There is enough evidence to support the claim that the average bill has increased from $50.07.

Question

The average monthly cell phone bill was reported to be $\$ 50.07$ by the U.S. Wireless Indus Random Sampling of a large cell phone company found the following monthly cell phone (in dollars):
$\begin{array}{llll}
\hline 52.62 & 46.27 & 59.77 & 67.21 \
57.26 & 49.24 & 45.99 & 46.81 \
55.39 & 48.08 & & \
\hline
\end{array}$

At the $0.05$ level of significance, can it be concluded that the average phone bill has incre ry. reased?
A) No. There is not enough evidence to support the claim that the average bill has increased from $50.07.
B) There is not enough information to draw a conclusion.
C) Yes. There is enough evidence to support the claim that the average bill has increased from $50.07.

Quizplus · Accepted Answer

To determine if the average phone bill has increased from $50.07, a hypothesis test comparing the sample mean to the reported mean is needed. The sample mean can be calculated from the provided data, and then a t-test or similar statistical test could be used to compare this sample mean to the reported mean of $50.07. Without performing the actual calculations here, the choice of "No" suggests that, based on the statistical test at the 0.05 level of significance, there isn't enough evidence to conclude that the average bill has increased from $50.07. This implies that the test result was not statistically significant.

The Average Monthly Cell Phone Bill Was Reported to Be $50.07\$ 50.07$50.07

The Average Monthly Cell Phone Bill Was Reported to Be $\$ 50.07$