Null & Alternate Hypothesis Tests?

[bronsin]

A local weight-loss company suggests that the average client loses 15 pounds
during the first month. A consumer advocate group feels that the actual number of
pounds lost is much less than this. To test the claim, they select 30 of the clients at
random and obtain the following data:
Pounds Lost During the 1
st
Month:
16 20 14 15 14 18 19 20 9 13
20 11 12 18 13 17 11 21 14 15
15 13 17 12 9 20 16 18 21 11
A hypothesis test is conducted.
a. State the null and alternative hypotheses.
b. The test statistic is t = 0.6107 with p-value = 0.7269. Based on this
information, what is the conclusion of the hypothesis test? Justify your
answer.

[atworth49]

Ho: Average client loses 15 pounds
Ha: Average client loses less than 15 pounds.

t = (Mean - 15) / std