Problem 3 (10 points) a. Using the data set for 20 students on a 10-item test, calculate
item difficulty and index of discrimination for each item. Use
the top five students to make up the upper group; and the bottom
five for the lower group. Present your results in the table
provided below (include the computations).
Item # Item Difficulty Item Discrimination Index
1
2
3
5
6
7
8
9
10

the answer is c hope it

step-by-step explanation:

c. y = 1/4 x + 5

step-by-step explanation:

first, put the equation of the line on the graph into slope-intercept form

(y = mx + b):   y = -4x + 8

second, a perpendicular line has to have "an opposite/reciprocal slope" to the original slope. so, find the "m" value in your original equation (it's -4, right? )

original slope: m = -4   perpendicular slope: change the sign to its opposite and find the reciprocal ("flip" the number)

new slope is now positive (b/c the original slope was negative 4), and it's 1/4 (not the original slope of 4 or 4/1)

answer: 80,000

step-by-step explanation:

the population doubles every day.

10,000*2=20,000 day 4

20,000*2=40,000 day 5

40,000*2=80,000 day 6