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Category > Psychology Posted 27 Nov 2017 My Price 10.00

PSY 305 COL Assignment 2

Before assigning yourself, please read the assignment, ensure you know all the answers.


PSY 305 COL Assignment 2 T-tests are used when you want to examine differences but you do not know everything about the population. There are three types of t-tests that you may choose to do: one- sample t-test, independent sample t-test, or dependent sample t-test. You can calculate these by hand, in SPSS, or in Excel. The instructions below can be used for SPSS and your textbook offers instructions for using Excel. Single-sample t-tests These tests are used when you want to determine the probability that a sample was drawn from a population with a known mean (μ) but with a standard deviation estimated from the sample.  Click on analyze, compare means, one-sample t-test  Copy the variables you want to test into the Test Variables box  Type the population mean into the Test Value box  Click on options to get: o Confidence intervals (95% is default) o Exclude cases analysis by analysis  If some data is missing, this will drop the data only in analyses where that data is missing. o Exclude cases listwise  If you are doing multiple t-tests and have missing data, this will drop participants who have missing data from all t tests  Click on continue, ok  The output will display the t-statistic, degrees of freedom (n-1), significance (two- tailed), and the confidence interval Independent sample t-test These tests are used when you want to determine the probability that two samples were drawn from the same population with unknown means and standard deviations; both of which are estimated from the sample. No population parameters are specified.  The data should be entered in one column and should be named as your dependent variable.  You will need another column of data to identify each group according to number. So, it is a good idea to have two columns of data (one for the IV and one for the DV).  For the IV column, you should use two consecutive numbers (I usually use 1 and 2)  Also, be sure to use variable view to name your variables (otherwise this can become very confusing) 1
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CourseLover
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Status NEW Posted 27 Nov 2017 07:11 AM My Price 10.00

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