Questions:
1. Research Question: Does the addition of perspective lines in the Ponso illusion change estimates of length?
a. State the null hypothesis in words and in terms of the mean:
b. State the alternative hypothesis in words and in terms of the mean:
2. Conduct a paired-samples t-test on the data and report your findings:
a. What is the mean difference between the samples?
b. What is the standard error of the mean?
c. What is the degrees of freedom?
d. What is your computed (obtained) t-value from SPSS?
e. What is the p-value (labeled Sig. in SPSS)?
f. Compare the p-value to ? =.05. Is the p-value higher or lower?
g. Does this indicate a significant result?
3. Write an APA-formatted results paragraph for your t-test analysis and include a histogram of the data.