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\$2.00psy 315 week 3 dq number 1 and 2

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week 3 dq number 2

2.What is the difference between a one-tailed and a two-tailed test of significance? Under what circumstances would each be used? Please provide examples.

1.Why is it said that hypothesis testing involves double negative logic?

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Preview: ... for the possibility of the relationship in both directions.Â  For example, we may wish to compare the mean of a sample to a given value x using a t-test.Â  Our null hypothesis is that the mean is equal to x . A two-tailed test will test both if the mean is significantly greater than x and if the mean significantly less than x . The mean is considered significantly different from x if the test statistic is in the top 2.5% or bottom 2.5% of its probability distribution, resulting in a p-value less than 0.05. Next, let's discuss the meaning of a one-tailed test.Â  If you are using a significance level of .05, a one-tailed test allots all of your alpha to testing the statistical significance in the one direction of interest.Â  This means that .05 is in one tail of the distribution of your test statistic. W ...

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