PSY 138 Lecture Notes - Lecture 25: Point Estimation, Interval Estimation, Scatter Plot
Document Summary
You can predict the value of one variable based on another by using point or interval estimation. Estimation: suppose that you want to see how effective practice is for math skills. After a practice test you find that 250 students get an average score of 212, with a sample standard deviation of 40. Point estimate of the population mean = 212. Computational (spss if you can) questions: a professor of philosophy hypothesizes that an intro course in logic will help college students with their studies. To test this hypothesis, he selects a random sample of n = 25 freshmen. These students are required to complete a logic class during their first year. At graduation, the gpa for each student is recorded. The mean gpa for the sample is 2. 83. Knowing that sums of squares = 6, find point estimate and 95% confidence interval for the mean gpa for students who take the logic course.
