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[DOCX File]Statistics in Biology - WELCOME TO MRS. HARENBERG'S CLASS!
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Typically, the null statistical hypothesis in a t-test is that the mean of sample 1 is equal to the mean of sample 2 or 𝑥 1 = 𝑥 2. Rejecting H 0 supports the alternative hypothesis, H 1,that the means are significantly different (𝑥 1 not equal to 𝑥 2). In the plant example, the t-test …
what does significantly different mean

[DOC File]1
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20. Recently, a group of adults who swim regularly for exercise were evaluated for depression. It turned out that these swimmers were less likely to be depressed than the general population. The researchers said that the difference was statistically significant. a) What does “statistically significant” mean in …
significantly different means

[DOC File]Example SPSS Output for T-Test for Difference in Means
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In the above example the p-value is .002, implying that the difference in means is statistically significant at the .1, .05. and .01 levels. Summary: To find the p-value for the hypothesis test for the difference in means, look in the column labeled “Sig. (2-tailed)” in the “t …
significantly different

[DOCX File]DeKalb Early College Academy
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A consumer advocacy group tests the mean vitamin C content of 50 different brands of bottled juices using, in each case, a t -test of significance in which the null hypothesis is the mean amount of vitamin C that is on the nutrition facts label for that brand of juice.
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[DOC File]Chapter 11- Testing A Claim
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7. How small should the p-value be in order to claim that a result is statistically significant? The p-value needs to be as small as or smaller than the alpha, α, level. The alpha level depends on our significance level. 8. What does statistically significant mean? This means that something, an event, is unlikely to happen by chance.
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[DOC File]What is meant by 'statistical power' and what is the ...
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Statistical power is when the values calculated from the data are statistically significant and can be considered "true". You want your research to have a lot of it because that would mean your results can be interpreted as true or not true. Statistical power refers to the ability to reject the null hypothesis.
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[DOC File]Short Answer Questions that could appear on exams:
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180. What does statistically significant mean? 181. What is a placebo? 182. What is the purpose of a placebo? 183. What is a double-blind experiment? 184. What is the purpose of a double-blind experiment? 185. Statistically significant depends on what two things? 186. Give an example of how lack of realism can cause problems in a experiment. 187.
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[DOC File]CHAPTER 12: CAUSAL-COMPARATIVE RESEARCH
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(b) the standard deviation, which indicates how spread out a set of scores is around the mean, that is, whether the scores are relatively homogeneous or heterogeneous around the mean.-The most commonly used inferential statistics are (a) the t test, used to determine whether the means of two groups are statistically different from one another;
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[DOC File]CHAPTER 17: SOCIAL STATISTICS
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b. As age increases so does the employment status. c. There is a positive association between age and employment status. d. Only a and b are correct. e. Only b and c are correct. ANS: E. 7. An appropriate measure(s) of association for the data presented in question #6 is (are) a. Gamma. b. Lambda. c. Chi square. d. Pearson's product moment ...
what does significantly different mean

[DOC File]Guide to calculating, interpreting and using effect size
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A slightly different way to interpret effect sizes makes use of an equivalence between the standardised mean difference (d) and the correlation coefficient, r. If group membership is coded with a dummy variable (e.g. denoting the control group by 0 and the experimental group by 1) and the correlation between this variable and the outcome ...
significantly different means

What does statistically different mean