Re: [tips] Sample Size: How to Determine it?

2013-08-27 Thread Paul C Bernhardt
[pcbernha...@frostburg.edu<mailto:pcbernha...@frostburg.edu>] Sent: 27 August 2013 08:41 To: Teaching in the Psychological Sciences (TIPS) Subject: Re: [tips] Sample Size: How to Determine it? There is software to determine this. One excellent and free app is G*Power. http://www.psych

RE: [tips] Sample Size: How to Determine it?

2013-08-27 Thread Wuensch, Karl L
: RE: [tips] Sample Size: How to Determine it? I was going to stay out of this discussion but I have to address a couple of points, one of which is made by Rick at the end of his post: (1) The major problem with power analysis is that it requires one to have knowledge of POPULATION PARAMETERS, that

RE: [tips] Sample Size: How to Determine it?

2013-08-27 Thread Mike Palij
I was going to stay out of this discussion but I have to address a couple of points, one of which is made by Rick at the end of his post: (1) The major problem with power analysis is that it requires one to have knowledge of POPULATION PARAMETERS, that is, the means, the standard deviation, the c

RE: [tips] Sample Size: How to Determine it?

2013-08-27 Thread rfro...@jbu.edu
ives thought to his steps." From: Michael Britt [mailto:mich...@thepsychfiles.com] Sent: Tuesday, August 27, 2013 9:00 AM To: Teaching in the Psychological Sciences (TIPS) Subject: Re: [tips] Sample Size: How to Determine it? Also helpful. So, to answer my own previous question, b

Re: [tips] Sample Size: How to Determine it?

2013-08-27 Thread Ken Steele
<mailto:pcbernha...@frostburg.edu>] *Sent:*27 August 2013 08:41 *To:*Teaching in the Psychological Sciences (TIPS) *Subject:*Re: [tips] Sample Size: How to Determine it? There is software to determine this. One excellent and free app is G*Power. http://www.psycho.uni-duesseldorf.de/abteilung

RE: [tips] Sample Size: How to Determine it?

2013-08-27 Thread Jim Clark
__ From: Paul C Bernhardt [pcbernha...@frostburg.edu<mailto:pcbernha...@frostburg.edu>] Sent: 27 August 2013 08:41 To: Teaching in the Psychological Sciences (TIPS) Subject: Re: [tips] Sample Size: How to Determine it

Re: [tips] Sample Size: How to Determine it?

2013-08-27 Thread Michael Britt
ttp://www.ubishops.ca/ccc/div/soc/psy > > " Floreat Labore" > ___________ > > From: Paul C Bernhardt [pcbernha...@frostburg.edu] > Sent: 27 August 2013 08:41 > To: Teaching in the Psy

Re: [tips] Sample Size: How to Determine it?

2013-08-27 Thread Michael Britt
Thanks Paul. I've downloaded G*Power. Question: the correlational component of the study revealed r = -.21, p<04 (higher tendency to humanize nature were associated with a lower tendency to help victims of a natural disaster). The next test will be an independent samples t-test. How does th

RE: [tips] Sample Size: How to Determine it?

2013-08-27 Thread Stuart McKelvie
" Floreat Labore" ___ From: Paul C Bernhardt [pcbernha...@frostburg.edu] Sent: 27 August 2013 08:41 To: Teaching in the Psychological Sciences (TIPS) Subject: Re: [tips] Sample Size: How to Determine it? There is softwar

Re: [tips] Sample Size: How to Determine it?

2013-08-27 Thread Paul C Bernhardt
There is software to determine this. One excellent and free app is G*Power. http://www.psycho.uni-duesseldorf.de/abteilungen/aap/gpower3/ I would use the correlational study to give me an estimate of effect size. As you describe, I would use that in the software to estimate my number of partici

[tips] Sample Size: How to Determine it?

2013-08-27 Thread Michael Britt
I'm reading an interesting piece of research on anthropomorphism which essentially states after a natural disaster if we use the term "mother nature" when describing it, people will be less willing to contribute to relief efforts ("Humanizing nature could help the perceiver to conceive natural e