Author Question: Calculate the average number of customers in the queue. A) 0.17 B) 0.40 C) 4.80 D) ... (Read 77 times)

formula1 · **on:** Jun 24, 2018

Calculate the average number of customers in the queue.

A) 0.17
B) 0.40
C) 4.80
D) 3.97

Question 2

List out the features of a power function in hypothesis testing.

What will be an ideal response?

cascooper22 · **Reply #1 on:** Jun 24, 2018

Answer to Question 1

D

Answer to Question 2

The power function has the following features:
1. The farther the true mean is from the hypothesized mean 0, the greater is the power of the test-everything else being equal.
2. The smaller the significance level() of the test, the smaller the powereverything else being equal. Thus, reducing the probability of Type I error increases the probability of Type II error , but reducing by 0.01 does not generally increase by 0.01; the changes are not linear.
3. The larger the population variance, the lower the power of the testeverything else being equal.
4. The larger the sample size, the greater the power of the testeverything else being equal. Note that larger sample sizes reduce the variance of the sample mean and, thus, provide a greater chance that we will reject H0 when it is not correct.
5. The power of the test at the critical value is the probability that a sample mean is above ( c).