Question

Why is the equation y=-5/14x+107 not the equation of a line of best fit for the data set below?



Age (years)
23 45 39 74 63 52 59 28 35 11 26 49
IQ 76 82 113 111 109 115 101 127 92 123 128 99
A.
The slope of the line is negative, but the data set has a positive correlation.
B.
The slope of the line is positive, but the data set has a negative correlation.
C.
The y-intercept of 107 will not produce a line that "centers" the scatter plot.
D.
The data set has no correlation and cannot be accurately represented with a linear equation.

Answer 1

@superdavesuper

Answer 2

Read the data points and look at the equation, what do u think is the right explanation? :)

Answer 3

A

Answer 4

Do u actually SEE any correlation in the data? I mean as age goes up or down, the IQ values go....?

Answer 5

When creating a scatterplot, if the points are too close together to see the relationship, how could you adjust your graph?
A.
decrease your scale values
B.
increase your scale values
C.
plot more points
D.
plot fewer points

Answer 6

Again read the Q...what would u do when something is "too close together"? ;)

Answer 7

D

Answer 8

AM i right?

Answer 9

Plot fewer points will work but u will miss some data so a better way will be....like what wuld u do if u want to look at a portion of a pic more clearly?

Answer 10

A?

Answer 11

Clever lady :)

Answer 12

Determine the x-coordinate that would yield a y-coordinate of 30, assuming the pair follows the same trend that currently exists in the data set below.
{(45, 18), (38, 21), (26, 31), (64, 13), (29, 28), (33, 25), (49, 17)}
A.
18
B.
27
C.
36
D.
38

Answer 13

Ooops what happend 2 ur Q?

Answer 14

OK...

Answer 15

(29, 28), (33, 25) so what do u think?

Answer 16

B?

Answer 17

U hardly need my help, Sonya! lol

Answer 18

Ive got two more can u still help me

Answer 19

Sure :) but only if they are easy! lol

Answer 20

In one of Mark's video games, his progress is recorded by the number of points he earns while he plays. Mark advances in the game by moving through a series of levels, earning points on the way. Theoretically, the farther Mark gets in his game, the more points he will earn. What type of correlation exists between the number of levels Mark has reached in his video game and the number of points Mark has earned in his video game?



A.
No correlation exists between the number of levels reached and the number of points earned in Mark's video game.
B.
There is a positive correlation between the number of levels reached and the number of points earned in Mark's video game.
C.
There is a negative correlation between the number of levels reached and the number of points earned in Mark's video game.
D.
There is not enough information to identify the type of correlation that exists between the number of levels reached and the number of points earned in Mark's video game.

Answer 21

i think tht its D

Answer 22

Theoretically, the farther Mark gets in his game, the more points he will earn....what do u think now?

Answer 23

B?

Answer 24

yup yup

Answer 25

last one

In a positive correlation, __________.
A.
the independent variable is always negative

B.
an increase in the independent variable has a corresponding increase in the dependent variable

C.
the dependent variable is always positive

D.
a decrease in the independent variable has a corresponding increase in the dependent variable

Answer 26

From the answer of ur last Q, what do u think of this Q? ;)

Answer 27

b. increase?

Answer 28

U better be getting an A this time, Sonya ;)

Answer 29

k thanx :D >< i did