Number 15 is 80 i dont know about the others...sorry
Answer:
y = 8x
Step-by-step explanation:
hope this is what u need if not comment and I'll change it
<3
Answer:

Step-by-step explanation:
Downtown Store North Mall Store
Sample size n 25 20
Sample mean
$9 $8
Sample standard deviation s $2 $1




Standard error of difference of means = 
Standard error of difference of means = 
Standard error of difference of means = 
Degree of freedom = 
Degree of freedom = 
Degree of freedom =36
So, z value at 95% confidence interval and 36 degree of freedom = 2.0280
Confidence interval = 
Confidence interval = 
Confidence interval = 
Hence Option A is true
Confidence interval is 
Rational: (-15.333), (sqt of 400), (8.62134), (15 5/6), (-3 4/5)
Irrational: (sqt of 6), (pi), (sqt of 56), (sqt of 31)