II. Donita is a researcher that having the desire to know about how long it takes a secretary to learn to use a new word processing program (in hours). She believed that important factor to be considered is the typing speed of a secretary (in words per minute). The data below are gathered from random sample of secretaries of various company:

Speed 48 74 52 79 83 56 85 63 88 74 90 92

Time 7 4 8 3.5 2 6 2.3 5 2.1 4.5 1.9 1.5

a. Please identify, what is the independent (x) and dependent (y) variable?

b. What are the numbers for these symbols?S= Sigma Symbol

x =

y=

S x =

Sx ^2 =

S y =

Sy^2 =

Sxy =

c. What is the correlation coefficient of these two variables? Please give your explanation on that information!

d. What is the least square regression line of these two variables?

e. Please draw the scattergram.

f. According to data above, predict the time it will take the average secretary who has a typing speed of 68 w o r d s per minute to learn the word processing program.