Psychological Statistics 502

May 17, 2001

Part 1: Data
Analysis

Read the following example of an experiment. Please answer the questions following the
example, calculate the appropriate inferential and descriptive statistics and
make a conclusion regarding the results of the experiment.

Experiment Description

It was hypothesized that people who are instructed to write an essay describing
Korea today will have a stronger present temporal focus than those who are asked to describe
Korea. The data are below.

Korea Today |
Korea |

1.00 5.00 3.00 2.00 4.00 5.00 4.00 4.00 3.00 2.00 |
3.00 4.00 4.00 4.00 4.00 3.00 4.00 2.00 3.00 4.00 |

A. What is
the Null Hypothesis?

B. What is
the Alternate Hypothesis?

C. What is
the proper inferential statistic to test these hypotheses?

t-test (between groups or related measures)

D. Calculate
the statistic:

E. In words,
describe the decision you make about the hypotheses.

F. What is
the probability of a Type 1 error?

Part 2 Analysis
Interpretation

Please read the description of the study below. Use the SPSS statistical output provided to
answer the questions.

Example 2