Search found 15 matches

by handbanana
Thu Dec 06, 2007 4:31 pm
Forum: Evolution
Topic: What determines facial expressions?
Replies: 13
Views: 7958

What determines facial expressions?

Let's say Australians and Chinese people share the same facial expressions in terms of happiness, being content and sadness.

Is that because of genetics or culture?
by handbanana
Wed Dec 05, 2007 6:03 pm
Forum: Evolution
Topic: Mammals do not have diversity interms of flying species...
Replies: 16
Views: 10491

Mammals do not have diversity interms of flying species...

Mammals are the most advanced but yet we're not diversed enough to have more flying species..
Why is that? Why we only have the bat?
by handbanana
Tue Dec 04, 2007 9:13 pm
Forum: General Discussion
Topic: Anova test help
Replies: 4
Views: 6560

How? Using a t-test?
by handbanana
Tue Dec 04, 2007 5:25 pm
Forum: Evolution
Topic: Dinosaurs and mammals
Replies: 3
Views: 2198

Dinosaurs and mammals

Mammals and reptiles have lived through major extinctions. Why reptiles did not become the dominant species over mammals?
by handbanana
Tue Dec 04, 2007 5:17 pm
Forum: General Discussion
Topic: Anova test help
Replies: 4
Views: 6560

Anova test help

Can some please explain the results? What is the P or F Value and how can I reject the null hypothesis? (The experiment is to test two popular anti bacterial agents in Petri dishes and see whether they indeed kill bacteria or not. Our hypothesis is that the two anti bacterial agents will indeed kill...
by handbanana
Fri Nov 30, 2007 5:33 pm
Forum: Evolution
Topic: What would happen if there are only 50 poeple on earth....
Replies: 5
Views: 2909

What would happen if there are only 50 poeple on earth....

and they have a duty to colonize earth and reproduce?

Are there any evolutionary advantages? What are the evolutionary outcomes? What about Hardy-Weinberg agents?

Thanks!
by handbanana
Fri Nov 30, 2007 5:02 pm
Forum: Evolution
Topic: Sexual production / Asexual production-What are the benifts?
Replies: 9
Views: 5576

Sexual production / Asexual production-What are the benifts?

Many organisms can survive w/asexual reproduction (amoeba, plants like ferns). So why the evolution to sexual? What make sexual better that asexual? Examples?

thanks!
by handbanana
Wed Nov 28, 2007 6:18 pm
Forum: General Discussion
Topic: t-test help
Replies: 14
Views: 10853

Here are the results I got from a t-test site (m) How would I interpret the results? What's my p value and null hypothesis? Student's t-Test: Results The results of an unpaired t-test performed at 12:04 on 28-NOV-2007 t= 2.83 sdev= 4.24 degrees of freedom = 21 The probability of this result, assumin...
by handbanana
Wed Nov 21, 2007 7:11 pm
Forum: General Discussion
Topic: t-test help
Replies: 14
Views: 10853

Do you know how can do the t-test using MS Excel 2007?
by handbanana
Mon Nov 19, 2007 6:42 pm
Forum: General Discussion
Topic: t-test help
Replies: 14
Views: 10853

yes we already have controlled environment that is disks dipped in water which has no effect on the bacteria lawn.

The diameter includes the surrounding area around the disc.

What should I put in for null hypothesis then?
by handbanana
Mon Nov 19, 2007 3:29 pm
Forum: General Discussion
Topic: t-test help
Replies: 14
Views: 10853

t-test help

We want to hypothesize that antibacterial solutions work. So we bring 12 petridishes, smear them with isolated bacteria and plant 3 paper discs dipped in antibacterials solutions to see if the bacteria grows or not. 3 days later, we see the bacteria all grown except around the paper discs. We measur...
by handbanana
Wed Nov 14, 2007 3:05 pm
Forum: Microbiology
Topic: How to test anti-bacterial wipes (experiment)
Replies: 2
Views: 1979

How to test anti-bacterial wipes (experiment)

We want to test the effectiveness of anti bacterial solutions.

We already have 2 petri-dishes filled with bacteria lawns. How should we set up the experiment?