
The t-test
... Reporting the Results: One Group t test The results showed that the students’ rated level of agreement with the statement “I feel good about myself” (M=3.4) was not significantly different from the scale’s neutral point (M=3.0), t(4)=.784. However, it is important to note several important limitati ...
... Reporting the Results: One Group t test The results showed that the students’ rated level of agreement with the statement “I feel good about myself” (M=3.4) was not significantly different from the scale’s neutral point (M=3.0), t(4)=.784. However, it is important to note several important limitati ...
Section 2: Estimation, Confidence Intervals and Testing Hypothesis
... Estimating Proportions... another modeling example Your job is to manufacture a part. Each time you make a part, it is defective or not. Below we have the results from 100 parts you just made. Yi = 1 means a defect, 0 a good one. ...
... Estimating Proportions... another modeling example Your job is to manufacture a part. Each time you make a part, it is defective or not. Below we have the results from 100 parts you just made. Yi = 1 means a defect, 0 a good one. ...
Theories - the Department of Psychology at Illinois State University
... Generally, not interested in “accepting the null hypothesis” (remember we can’t prove things only disprove them) Usually check to see if you made a Type II error (failed to detect a difference that is really there) • Check the statistical power of your test • Sample size is too small • Effects that ...
... Generally, not interested in “accepting the null hypothesis” (remember we can’t prove things only disprove them) Usually check to see if you made a Type II error (failed to detect a difference that is really there) • Check the statistical power of your test • Sample size is too small • Effects that ...
Class 2 - Courses
... • P-Value: Area to the right of 1.321 and to the left of -1.321= 2*(1-0.9020648)= 0.196 (found with a statistical package) ...
... • P-Value: Area to the right of 1.321 and to the left of -1.321= 2*(1-0.9020648)= 0.196 (found with a statistical package) ...
9.1.2 Confidence Interval - Known SD
... 2. Suppose park rangers want to conduct an observational study of Old Faithful in Yellowstone Park to help visitors plan their trip to the park. Determine the sample size needed to be 99% confident that the true mean interval of time between eruptions is within 30 seconds. (Remember the standard dev ...
... 2. Suppose park rangers want to conduct an observational study of Old Faithful in Yellowstone Park to help visitors plan their trip to the park. Determine the sample size needed to be 99% confident that the true mean interval of time between eruptions is within 30 seconds. (Remember the standard dev ...