Discuss the below:
Q: The table gives the average low tempatures in January and July for twelve cities. Construct a 99% confidence interval for the mean temperature difference (January-July) between winter and summer. Assume the population are normally distributed.
| Cities |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
| JANUARY |
31 |
22 |
28 |
39 |
17 |
14 |
29 |
16 |
9 |
24 |
36 |
15 |
| JULY |
58 |
56 |
65 |
65 |
58 |
60 |
59 |
57 |
48 |
62 |
75 |
64 |
Choose the 99% confidence interval for the mean difference )January-July) in the average low temperature.