Author Question: X is a random variable with the probability function: f(x) = x/6 for x = 1, 2, or 3 . The expected ... (Read 225 times)

lracut11 · **on:** Jun 24, 2018

x is a random variable with the probability function: f(x) = x/6 for x = 1, 2, or 3 . The expected value of x is _____.
a. 0.333
b. 0.500
c. 2.000
d. 2.333

Question 2

A student believes that no more than 20 (i.e., 20) of the students who finish a statistics course get an A. A random sample of 100 students was taken. Twenty-four percent of the students in the sample received 'A's.
a. State the null and alternative hypotheses.
b. Using the critical value approach, test the hypotheses at the 1 level of significance.
c. Using the p-value approach, test the hypotheses at the 1 level of significance.

AngeliqueG · **Reply #1 on:** Jun 24, 2018

Answer to Question 1

d

Answer to Question 2

a. H0: p .2
Ha: p > .2
b. Do not reject H0; test statistic z = 1 < 2.33
c. Do not reject H0; p-value = .1587 > .01