Question

1. A researcher wants to know if the typing speed of a secretary in words per minute is related to the time in hours that it takes to learn the new word processing program. Below is speed versus hours to learn program. What is the regression equation? Typing speed --48- 74 - 52-- 79-- 83-- 56-- 85-- 63-- 88-- 74-- 90-- 92 Time hrs.----- --7---- 4---- 8 -- 3.5 --2 -- 6 ---2.3-- 5 -- 2.1-- 4.5--1.9- 1.5 Select one: a. y = 0.19 x - 18.7 b. y = 0.354 x - 21.3 c. y= -0.137 X + 14.086 d. y = 0.34 X - 19.8

2. A researcher wants to know if the typing speed of a secretary in words per minute is related to the time in hours that it takes to learn the new word processing program. Below is speed versus hours to learn program. Find the 90 % prediction interval for number of hours it would take an average secretary who has a typing speed of 72 words per minute to learn the word processing program.

Typing speed --48- 74 - 52- 79-- 83- 56- 85- 63- 88- 74- 90- 92
Time hrs.----- --7- ---4--- 8 - 3.5----2 - 6 --2.3- 5 - 2.1- 4.5-1.9- 1.5

Select one:

a. 2.5 < y < 5.4

b. 3.34 < y < 5.1

c. 4.5 < y < 6.25

d. 2.5 < y < 4.8

3. A researcher wants to know if the typing speed of a secretary in words per minute is related to the time in hours that it takes to learn the new word processing program. Below is speed versus hours to learn program. What is the correlation coefficient?

Typing speed --48- 74 - 52- 79-- 83- 56- 85- 63- 88- 74- 90- 92
Time hrs.----- --7- ---4--- 8 - 3.5----2 - 6 --2.3- 5 - 2.1- 4.5-1.9- 1.5

4. A researcher wants to know the relationship between the number of cows ( in thousands) in certain counties and the milk production ( in million pounds).
The data is shown below. Estimate the amount of milk if there are 125 million cows in the county. Write answer in millions of pounds (85 if there are 85 million pounds)

Cows (millions) ------70-----3-----194-----12-----46-----65
Milk (Million #)--------115----5-----289-----15-----72-----92

5.

Question text

A researcher wants to know if the typing speed of a secretary in words per minute is related to the time in hours that it takes to learn the new word processing program. Below is speed versus hours to learn program. Predict the number of hours it would take an average secretary who has a typing speed of 72 words per minute to learn the word processing program.

Typing speed --48- 74 - 52- 79-- 83- 56- 85- 63- 88- 74- 90- 92
Time hrs.----- --7- ---4--- 8 - 3.5----2 - 6 --2.3- 5 - 2.1- 4.5-1.9- 1.5

6.

Question text

A researcher wants to know if the typing speed of a secretary in words per minute is related to the time in hours that it takes to learn the new word processing program. Below is speed versus hours to learn program. Find the standard error of estimate for an average secretary who has a typing speed of 72 words per minute to learn the word processing program.

Typing speed --48- 74 - 52- 79-- 83- 56- 85- 63- 88- 74- 90- 92
Time hrs.----- --7- ---4--- 8 - 3.5----2 - 6 --2.3- 5 - 2.1- 4.5-1.9- 1.5

Answer 1