Question

Help Please? ( Idk how this works)
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 standard 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?

Answer 1

http://prntscr.com/6k7bnl

Answer 2

I have attempted part (a) which is 1.956 standard deviations above the mean

Answer 3

@tkhunny do you recall how to work this type of problem?

Answer 4

zarkon and satellite might be useful but i dont see them about

Answer 5

Ahh ok thanks. I'm at an Australian uni and this is 1st year statistics btw.

Answer 6

it looks like a multivariate stuff. i dont recall dong it in my first year stats class.

Answer 7

if we did we used a ti83 stats calculator

Answer 8

filling in the lists and then using one of the preprogrammed stat functions

Answer 9

Our lecturer didnt mentioned anything to do with that. It should be anything too advanced though.

Answer 10

Shouldn't*

Answer 11

2 sd sales persons ==> 2*0.978 sd sales

Answer 12

Yea, so for part a, it would be 1.956 standard deviations above the mean. But I can't remember how we could use that for part (b) ....