10-17-08 - When asked about what score, the problem is...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Psychology 206 – Class Notes – 10/17/08 TODAY: Random assignment and Random sampling (exercise #14) Z scores – 2 nd type of problem – THERE WILL BE ONE OF THIS TYPE OF PROBLEM ON THE QUIZ Exercise #15 For Monday: Quiz 2 (Chapters 7, 8, 9) Optional Exercise #16 (everyone gets 3 points) Sunday at 8:00 P.M : Help session Work on Optional Exercise #16 Normal room or room 110 in Carnegie Hall Main focus: working through problems on exercise #16 QUIZ- MAIN TOPICS : Central Tendency Variability Z scores FOR QUIZ : If asked for conclusions: Causality? o Causal conclusions can/cannot be made because of random assignment Generalizability? o Generalizable to the larger population? Be sure to state why!
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Z SCORE Z = (X – u) / pop. Std. deviation 1. Solve for Z (what we have been doing so far) 2. Solve for X (given some type of area or value that allows you to determine X) EXAMPLE PROBLEMS 2 different types of problems (see above)
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: When asked about what score, the problem is asking for you to solve for X Middle 80% - The distribution is symmetrical, so 40% on each side More extreme refers to the two tails! What scores cut off the most extreme .05? o Then you divide this given value by two in order to get BOTH TAILS! Bottom 80% refers to 80% measured from the left (negative side) o Bottom 80% also refers to the 80% tile o A score asked in regards to the bottom 80%, the question is the same as asking for a percentile! What score cuts off the bottom x% of the distribution? IS THE SAME AS. What is the x percentile? If you are looking for a score that cuts off the top 2.5%, you would look up the area (0.0250) and read the Z score that corresponds to that value. Then you use that Z score in your Z-score formula to solve for X....
View Full Document

This note was uploaded on 06/03/2009 for the course PSYCH 206 taught by Professor Kenney-benson during the Fall '07 term at Allegheny.

Page1 / 2

10-17-08 - When asked about what score, the problem is...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online