Time to Practice Week 3

In: Philosophy and Psychology

Submitted By cricks
Words 1891
Pages 8
University of Phoenix Material

Time to Practice – Week Four

Complete Parts A, B, and C below.

Part A

Some questions in Part A require that you access data from Statistics for People Who (Think They) Hate Statistics. This data is available on the student website under the Student Text Resources link.

1. Using the data in the file named Ch. 11 Data Set 2, test the research hypothesis at the .05 level of significance that boys raise their hands in class more often than girls. Do this practice problem by hand using a calculator. What is your conclusion regarding the research hypothesis? Remember to first decide whether this is a one- or two-tailed test.

The conclusion reached is that this is a two tailed test showing there is no difference between the levels of significance in boys or girls raising their hands.

2. Practice the following problems by hand just to see if you can get the numbers right. Using the following information, calculate the t test statistic.

a. [pic] Find the pooled S2 = 2.45 (9 / 18) + 3.16 (9 / 18) = 2.45 Variance for 1 = 2.45 / 10 = 0.245 Variance for 2 = 0.245 Pop Variance = 0.245 + 0.245 = 0.49 Sqrt 0.49 = 0.7 T = (62 – 60) / 0.7 = 2.86

b. [pic] Find the pooled S2 = 2.06 (21 / 46) + 2.59 (25 / 48) = 2.35 Variance for 1 = 2.35 / 22 = 0.107 Variance for 2 = 2.35 / 26 = 0.0903 Pop Variance = 0.107 + 0.0903 = 0.197 Sqrt 0.197 = 0.444 T = (158 – 157.4) / 0.444 = 1.35

c. [pic] Find the pooled S2 = 2.45 (16 / 32) + 2.35 (16 / 32) = 2.40 Variance for 1 = 2.45 / 17 = 0.144 Variance for 2 = 2.35 / 17 = 0.138 Pop Variance = 0.144 + 0.138 = 0.282 Sqrt 0.282 = 0.531 T = (200 - 198) / 0.531 = 3.77…...

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