Author Question: Which of the following statements about a discrete random variable and its probability distribution ... (Read 126 times)

jace · **on:** Jun 24, 2018

Which of the following statements about a discrete random variable and its probability distribution is true?
a. Values of the random variable can never be negative.
b. Negative values of f(x) are allowed if f(x) = 1.
c. Values of f(x) must be greater than or equal to zero.
d. The values of f(x) increase to a maximum point and then decrease.

Question 2

Some people who bought X-Game gaming systems complained about having received defective systems. The industry standard for such gaming systems has been 98 non-defective systems. In a sample of 120 units sold, 6 units were defective.
a. Compute the proportion of defective items in the sample.
b. Compute the standard error of .
c. At a 5 level of significance using the critical value approach, test to see if the percentage of defective systems produced by X-Game has exceeded the industry standard.
d. Show that the p-value approach results in the same conclusion as that of part b.

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

Answer to Question 1

c

Answer to Question 2

a. .05
b. .0128
c. Test statistic z = 2.35 > 1.645; reject H0; the number of defects has exceeded the industry standard.
d. p-value (.0094) < .05; reject H0.