regression and correlation

Question 1

what is a regression line

Answer 1

line of best fit
y=a + bx
a is y when x=0
b is how much y changes with x

Question 2

product moment correlation coeffiecitn notation

Answer 2

r for a sample
r varies betweeen -1 and 1

p for a popualtion

Question 3

what is interpolation

Answer 3

estimating inside data range
reliable

Question 4

what is extrapolation

Answer 4

estimating outside data range
not reliable

Question 5

how to solve if y=ab^x

Answer 5

take logs

Question 6

how to solve if y=ax^n

Answer 6

takje loigs

Question 7

Venn diagrams shading for unions (U) and intersections (n)

Answer 7

U: shade all of both regions
n: shade overlap of regions

Question 8

what does product moment correlation coeffiecitn indicate

Answer 8

if there is likely to be a linear relationship within the whole population

Question 9

steps for hypothesis testing with correlation

Answer 9

hypothesis
data critical region
compare
conclusion

Question 10

if a and b are mutually exclusive
p(AnB)=
P(AuB)=

Answer 10

p(AnB)=0
P(AuB) = P(A) + P(B)

Question 11

what does B|A mean

Answer 11

probablity of A given that B has already been pciked

Question 12

if A and B are inderpended
P(AnB) =
P(a|B) =

Answer 12

in fomrula booklet

Question 13

if a and b conditional
P(B|A) =

Answer 13

P(AnB)/P(A)

Question 14

addition law P(AuB)

Answer 14

formula book