Independent samples design, Matched pairs design.
Not what you're looking for?
See attachment for complete question.
3 Four experimenters investigated the number of items recalled in a study of short-term memory when comparing some 25 year-old participants (Y) with some 65 year-old participants (O). (Use a two-tailed test.) For this question you will be assigned data from one of these experiments on the basis of the first letter of your last name.
If your last name begins with the letters A-E use data from Experiment 1
If your last name begins with the letters F-K use data from Experiment 2
If your last name begins with the letters L-R use data from Experiment 3
If your last name begins with the letters S-Z use data from Experiment 4
Expt 1 Expt 2 Expt 3 Expt 4
Y O Y O Y O Y O
13 9 11 8 12 4 12 5
10 8 10 8 13 10 11 5
11 9 9 4 11 5 9 9
8 6 8 6 7 9 9 7
9 12 9 6 12 9 12 5
13 10 8 8 10 8 9 9
12 8 7 5 14 7 10 8
11 10 7 8 8 9 10 8
Expt 4 is what I am doing
(a) Analyze the data as an independent samples design. On a standard answer sheet, state the null and alternative hypotheses in words, the critical value of t required to reject Ho, for a given value of alpha, and the appropriate degrees of freedom. Perform the calculations (using calculator or computer), and attach the calculations to the standard answer sheet. Make the appropriate statistical decisions, and indicate how this would be reported (include means and report effect sizes as r2). For example, "significantly more items were recalled by younger (mean=10.7) than older (mean=6.2) participants (t(14)=3.8, p<0.05, r2=0.239)".
(b) The researchers then realised that they had matched participants on sex and estimated intelligence. Analyze the same data set as a matched pairs design. On a standard answer sheet state the null and alternative hypotheses in words, the critical value of t required to reject Ho, for a given value of alpha, and the appropriate degrees of freedom. Perform the calculations (using calculator or computer), and attach the calculations to the standard answer sheet. Make the appropriate statistical decisions, and indicate how this would be reported (include means and report effect sizes as Cohen's d). For example, "there were no statistical differences in the numbers of items that were recalled by younger (mean=10.9) than older (mean=9.0) participants (t(7)=2.376, p<0.05, d=0.376)".
Purchase this Solution
Solution Summary
Data from a study of short-term memory are analyzed using a) an independent samples design b) matched pairs design.
Purchase this Solution
Free BrainMass Quizzes
Know Your Statistical Concepts
Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.
Terms and Definitions for Statistics
This quiz covers basic terms and definitions of statistics.
Measures of Central Tendency
Tests knowledge of the three main measures of central tendency, including some simple calculation questions.
Measures of Central Tendency
This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.