Download presentation

Presentation is loading. Please wait.

1
Lect 10b1 Histogram – (Frequency distribution) Used for continuous measures Statistical Analysis of Data ______________ statistics – summarize data

2
Lect 10b2 Bar Graph: Used for ______________ measures

3
Lect 10b3 Descriptive statistics 2, 2, 3, 5, 5, 7, 8 Mean = _____ Median = ____ Mode = _____ 2, 3, 3, 4, 6, 7 Mean = _____ Median = _____ Mode = ____ Central tendency- _____ score ______, ______, _____

4
Lect 10b4 Descriptive statistics 2, 2, 3, 5, 5, 7, 8 Mean = 4.57 Median = 5 Mode = 2, 5 2, 3, 3, 4, 6, 7 Mean = 4.33 Median = 3.5 Mode = 3 Central tendency- typical score mean, median, mode

5
Lect 10b5 Measure of variability – how spread out are the scores 1. Range – difference between ________ and _______ score 1, 2, 9, 6, 9 Range? 2. ______________________ - square root of the variance (average squared deviation from the mean).

6
e.g., if the SD of scores on a test was 6.9 we can conclude that ____% of the class fell within plus or minus 6.9 points of the mean. 1 Standard deviation = 68% scores 2 Standard deviations = 95% scores 3 Standard deviations = 99.7% scores

7
Lect 10b7 Large amount of variability – _____ convinced of effect Little variability – _____ convinced of effect Measures of central tendency presented without measures of variability can be _______________!

8
Lect 10b8 Inferential Statistics Most common method for analyzing data in studies using ______________ (Single-subject designs use _______ only) ________ used to evaluate whether or not there is a functional relationship. p<_____ = suggests a functional relation Statistical significance never _____ a hypothesis, only shows that it isn’t _____

9
Lect 10b9 Inferential Statistics Imagine you are doing a study with two groups. One gets treatment and one doesn’t. There are differences across groups due to the IV (hopefully not a confound) – _______________________ Even if the IV had no effect, we would expect variability across groups due to sampling error and chance factors and variability within a group due to chance factors (_______ ___________)

10
Rat #Immediate Food Rat #Delayed Food 112619 213720 3168 411918 5141015 M1 = 13.2M2= 17.6 SD = 1.9SD=2.1 How do tell whether this difference is a difference due to the IV or error? – Inferential statistics Rats in maze are given food for going the right way either immediately or after a delay.

11
Lect 10b11 Inferential Statistics Inferential statistics give you the probability of obtaining the difference in means you observed if there really was ___________________ The difference is judged significant if the probability is below α (_______), usually set to 0.05 Image from Introductory Statistics: Concepts, Models, and Applications David W. StockburgerIntroductory Statistics: Concepts, Models, and Applications

12
Lect 10b12 Null hypothesis _______________in population means Can either be _______ or ________ Rejecting the null means you support the ________________ hypothesis P value = calculated probability of obtaining these data given the null is true. (The _______ the p value the better) Obtain a p value of.05 means that there is a ___% chance that you would have obtained the results given that there really was ___ ____________ between the two groups

13
Lect 10b13 Inferential Statistics Statistics for calculating significance usually compare: Test statistic = Between-group variance (M1-M2) Error variance (standard error) Rat maze example: t = -6.4/1.55 = -4.13 (significant at the α =.01 level). Reject Null: Supports the hypothesis that reinforcer delay affects choice.

14
Lect 10b14 Errors in Hypothesis Testing ________ error - “False alarm” There is ____ difference (Null is true) but We conclude that there _____ a difference (We reject null) _________ error – “Miss” There ____ a difference (Null is false) but We conclude that there is ____ difference (We accept null)

Similar presentations

© 2021 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google