Data from a small bookstore are shown in the accompanying table. The correlation for the date is 0.978. Compelete parts a through d.
a) If the number of people working is 2 stantard deviations above the mean, how many standard deviations above or below the mean do you expect sales to be? (Below or Above)
b) What value of sales does that correspond to?
c) If the number of people working is 1 standard deviation below the mean, how many standard deviations above or below the mean do you expect sales to be? (Below or Above)
d) What value of sales does that correspond to?
| Number of sales people working / |
Sales (in $1000) |
| 2 |
11 |
| 4 |
12 |
| 6 |
14 |
| 9 |
15 |
| 11 |
19 |
| 11 |
21 |
| 13 |
21 |
| 14 |
23 |
| 16 |
23 |
|
20
x=10.6
SD(x) = 5.54
|
27
y=18.6
SD(y)= 5.34
|