Last year, Jack found that the average price of a widget in hardware stores in his city was approximately normally distr

[answerhappygod]

Last year, Jack found that the average price of a widget in
hardware stores in his city was approximately normally distributed
with mean $21.65. He believes that the average price is lower this
year and has found a mean of $19.83 for a randomly chosen sample of
32 stores. Which of the following should be the null hypothesis for
the test he should do to test his theory?

A. This year's average price is no more than
$21.65
B. This year's average price is no more than
$19.83
C. This year's average price is at least
$19.83
D. This year's average price is at least
$21.65