Discussion:
Q: A new weight-watching company advertises that those who join will lose, on average, 10 lbs. the first two weeks. A random sample of 50 people who joined revealed the mean loss to be 9 lbs. with a standard deviation of 2.8 lbs. At the .05 level of significance, can we conclude that those joining on average will lose less than 10 lbs.?
a) Is this a Z or T test
b) Test statistic
c) Critical value
d) P-value
e) Reject Ho: