Acollege instructor is interested in whether assigning mandatory homework affects students' grades. she is currently teaching two sections of the same class. therefore, the instructor assigns homework to one of the classes and just recommends homework problems to the second class. then she determines the number of people in each class that will receive either an a, b, c, d, or f on the final exam. what type of statistical test would the instructor use to analyze her data?
a) chi-square test for goodness-of-fit
b) chi-square test for independence
c) analysis of variance
d) independent-samples t test

idk

step-by-step explanation:

y=3n + 1

step-by-step explanation:

this is wrong because it says the second number is one less and i added one instead

(b) 240

step-by-step explanation:

first, we use the pythagorean formula using the given side lengths to find x. then we use x to find the side lengths. then we add the side lengths to find the perimeter.

pythagorean theorem formula:

a^2 + b^2 = c^2

(x - 20)^2 + (x - 40)^2 = x^2

x^2 - 40x + 400 + x^2 - 80x + 1600 = x^2

x^2 -120x + 2000 = 0

(x - 100)(x - 20) = 0

x - 100 = 0 or x - 20 = 0

x = 100 or x = 20

we see that the solution x = 20 must be discarded because it will give a negative side length and a side length of 0. the only valid solution is x = 100.

perimeter = sum of the lengths of the sides

perimeter = x + x - 20 + x - 40

perimeter = 3x - 60

replace x with 100.

perimeter = 3(100) - 60

perimeter = 300 - 60

perimeter = 240