Stat 160 Prequiz over Section 10.4, 10.5


This work is to be submitted for credit. Attempt all problems. Make sure you have attempted all problems before you submit. You may solve the problems several times, but only the first submission will get credit. Remember, don't hit the enter key until you are ready to submit this quiz.

Please fill out the information below.

Your User Name: 
Your Password: 
1. In a randomized paired design the data come in

Bags.
As independent samples.
In pairs.
As discrete data.
2. The signed rank Wilcoxon statistic counts up

The number of pairs where the first item is positive.
The number of pairs where the first item is negative.
The number of polar magnetic switches.
The number of positive Walsh averages.
3. Suppose in a paired design there were 12 pairs. What is the expected value of the signed rank Wilcoxon if the null hypothesis is true?

12.
6.
24.
39.
4. Consider a confidence interval for the difference between two proportions. Suppose the null hypothesis is that the proportions are the same. If the confidence interval contains all positive values then we can say

The true proportions differ significantly.
The true proportions do not differ significantly.
The result is inconclusive.
The sample size is too small.