Mrs. Hiatt puts the names of all 15 of her second period students on popsicle sticks and places them in a jar. When she wants to call on someone, she chooses a popsicle stick. She always replaces the popsicle stick before she draws another name. What is the probability that a student would be called on twice in a row? Give your answer as a decimal rounded to the nearest thousandth. P(twice in a row) =

Solve for the discrimination indexes of the following test items: Item No. 1 2 4 5 UG LG UG LG UG| LG UG LG UG LG No. of Correct Responses No. of Students 12 20 10 20 10 10 24 25 25 25 25 25 25 25 25 25 25 Discrimination Index Based on the commnuted discrimination indey Tarhich are good test items? Not goO 20 20

Let (X, V) be two random variables that follow the distribution with joint density Scry? if a

A psychology class consists of 32 freshmen and 48 sophomores. If the professor selects names from the class list using random sampling. What is the probability that the first student selected will be a freshman? p = If a random sample of n = 6 students is selected and the first five selected are sophomores, what is the probability that the sixth student selected will be a freshman? p = What is the probability that the first student selected will be a freshman after 10 sophomores students join the class? p =

Locations for its new stores. The management of the chain wanted to know whether a linear relationship exists between weekly take-home pay (x) and weekly food expenditures (y). A random sample of eight households produced the data shown in the following table Household 1 A supermarket chain performed a survey to help determine desirable 2 4 5 6 7 8 550 450 560 340 510 710 470 660 170 100 160 80 120 190 140 140 y al Find the least square regression line. b/ Perform the test Ho: B1 = 0, HA: B1 # 0 (using a = 0.05) to determine whether there is enough evidence to infer that a linear relationship exists between weekly take-home pay (x) and weekly food expenditures (y). %3D