Statistical Methods for Psychology

78 Chapter 3 The Normal Distribution 15 Sample from normal distribution Sample from normal distribution Q-Q plot for normal samp ...

was easier to send you to tables of the normal distribution if that was the case. However, you will often come across Q-Q plots ...

Exercises 3.1 Assume that the following data represent a population with m54 and s51.63: X 5 [1 2 2 3 3 3 4 4 4 4 5 5 5 6 6 7] a ...

Exercises 81 a. The most productive 10% of the faculty will have a raise equal to or greater than $. b. The 5% of the faculty wh ...

82 Chapter 3 The Normal Distribution a. Then create a Q-Q plot for each variable and notice the differences from one plot to the ...

Exercises 83 3.24 The data file named sat.dat on the Web site contains data on SAT scores for all 50 states as well as the amoun ...

This page intentionally left blank ...

CHAPTER 4 Sampling Distributions and Hypothesis Testing CHAPTER 4 Sampling Distributions and Hypothesis Testing Objectives To la ...

IN CHAPTER2 we examined a number of different statistics and saw how they might be used to describe a set of data or to represen ...

random sample of fifty courses we find a general trend for students in a course in which they expect to do well to rate the cour ...

they consider higher in status. If the differences are small enough to attribute to chance variability, we may well not worry ab ...

derived mathematically, but it is easier to understand what they represent if we consider how they could, in theory, be derived ...

Ruback and Juieng (1997) found a difference of 6.88 seconds in leaving times between the two conditions. It is quite clear from ...

The Traditional Approach to Hypothesis Testing For the next several pages we will consider the traditional treatment of hypothes ...

On the basis of that probability, we made a decision: either to reject or fail to reject. Because states the means of the popul ...

several reasons. The philosophical argument, put forth by Fisher when he first introduced the concept, is that we can never prov ...

differences that we were not able to identify conclusively with our relatively small sample of observations. Fisher’s position w ...

4.5 Test Statistics and Their Sampling Distributions We have been discussing the sampling distribution of the mean, but the disc ...

At this point we have to become involved in the decision-makingaspects of hypothesis testing. We must decide whether an event wi ...

X(the variable) that describe the boundary or boundaries of the rejection region(s). For this particular example the critical va ...