1 / 8

PSY 307 – Statistics for the Behavioral Sciences

PSY 307 – Statistics for the Behavioral Sciences. Practice Examples. Example 1.

dianeparker
Download Presentation

PSY 307 – Statistics for the Behavioral Sciences

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. PSY 307 – Statistics for the Behavioral Sciences Practice Examples

  2. Example 1 • Are women really more talkative than men? Mehl and colleagues report the results of a study of 396 men and women. Each participant wore a microphone that recorded every word he or she uttered. The researchers counted the number of words uttered by men and women and compared them. • Is this between or within subject? • What is N?

  3. Example 2 • Assume that we know the following for a t-test: • N = 13 • Mdifference = -0.77 • Sdifference = 1.42 • Calculate t • Calculate a 95% confidence interval for a two-tailed test.

  4. Example 3 • Bardwell, Ensign & Mills (2005) assessed the moods of 60 male U.S. Marines following a month-long training exercise. Mean mood scores were compared to population norms for three groups: college men, adult men, and male psychiatric outpatients. The population mean for college men is 8.9. The Marine mean is 13.33. Sample sd is 2.0. • Calculate t

  5. Example 4 • Is it harder to get into grad programs in psychology or history? We randomly selected 5 institutions from among all US universities with grad programs. Programs were compared with each other on a campus-by-campus basis. • Which type of t-test should be used?

  6. Example 5 • A study by Raz and colleagues (2005) used brain-imaging techniques to explore whether posthypnotic suggestion led highly hypnotizable people to see Stroop words as nonsense words. One sample consisted of participants who received no posthypnotic suggestion. The other consisted of those receiving a suggestion. • Which type of t-test should be used?

  7. Example 6 • A survey of 11 physicians in private practice showed that they felt that the pressures of their jobs necessitated taking a mean of 23.5 days of vacation per year. The sample std deviation was 4.0 days. Eleven physicians in clinical practices with at least three other doctors responded that a mean of 19.0 days were necessary with a std deviation of 3 days. • Do the groups differ in their opinions about how much vacation is needed to avoid extreme stress?

  8. Write down the info given: • N1 = 11 • N2 = 11 • M1 = 23.5 • M2 = 19.0 • s1 = 4.0 • s2 = 3.0

More Related