We are studying the times required to solve two elementary math problems. Suppose we ask four students to attempt Problem A and four other students to attempt Problem B. Assume everything is independent and normal. The results are presented below (in seconds) Problem A Problem B
20 35
30 20
15 50
40 40
Assuming that the variances are unequal, find a two-sided 95% confidence interval for the difference in the means between Problems A and B.

the answers c

it is contrapositive

i could not see the question too well so check yourself again too . this is because i want you to get it correct.

option c) graph of line going through 1, 4 and 3, 10

step-by-step explanation:

let y equal to margo's coin collection

let x equal to number of years

at the begining x=0, y=1 → point=(x,y)→point=(0,1)

she adds 3 coins per year, then y=1+3x

at x=1, y=1+3(1)=1+3→y=4→point=(x,y)→point=(1,4)

at x=3, y=1+3(3)=1+9→y=10→point=(x,y)→point=(3,10)

the graph of line going through (1, 4) and (3, 10), then the option c is the correct.