1a Independent samples t test Dr Holland would like to assess the impact of drinking Red Bull on attention levels A sample of 30 participants is obtained Half (n 15) are given Red Bull while the other half (n 15) are given a glass of water Each group of participants is eventually tested on a complex puzzle and the number of minutes it takes them to solve the puzzle is recorded Below is the data obtained Answer the following questions Show your work and round to the third decimal whenever necessary Control Group Experimental Group M 1 44 M 2 49 SS 1 310 SS 2 530 State your hypotheses Does the data indicate a significant difference between the treatments for a two tailed test at the 05 level of significance Please specify (1) the t statistic, (2) specify the boundaries of the critical region, (3) state your decision Show your computations for full credit Compute r 2 Write up your results in a sentence as you would for a research paper use APA format 1 b Related Samples t test A psych instructor gives his class of n 9 college students a Stats test at the beginning of the school year He believes students will score much differently at the end of the semester To evaluate the changes that occur during the year, students are tested again at the end of the semester Their test scores revealed a mean difference of M D 5 6 points Round to the third decimal whenever necessary State your hypotheses If s 2 81, are the results sufficient to conclude that there is significant difference Use a one tailed test with 05 Please specify (1) the t statistic, (2) the boundaries of the critical region, (3) state your decision Show your computations for full credit c Compute Cohen's d d Write up your results in a sentence as you would for a research paper use APA format

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1a. Independent samples t-test Dr. Holland would like to assess the impact of drinking Red Bull on attention levels. A sample of 30 participants is

1a. Independent samples t-test

Dr. Holland would like to assess the impact of drinking Red Bull on attention levels. A sample of 30 participants is obtained. Half (n = 15) are given Red Bull while the other half (n = 15) are given a glass of water. Each group of participants is eventually tested on a complex puzzle and the number of minutes it takes them to solve the puzzle is recorded. Below is the data obtained:

Answer the following questions. Show your work and round to the third decimal whenever necessary.

	Control Group	Experimental Group
	M₁=44	M₂=49
	SS₁=310	SS₂=530

State your hypotheses
Does the data indicate a significant difference between the treatments for a two-tailed test at the .05 level of significance? Please specify (1) the t statistic, (2) specify the boundaries of the critical region, (3) state your decision. Show your computations for full credit
Compute r²
Write up your results in a sentence as you would for a research paper; use APA format.

1.b Related-Samples t-test

A psych instructor gives his class of n = 9 college students a Stats test at the beginning of the school year. He believes students will score much differently at the end of the semester. To evaluate the changes that occur during the year, students are tested again at the end of the semester. Their test scores revealed a mean difference of M_D= 5.6 points.

Round to the third decimal whenever necessary.

State your hypotheses
If s² = 81, are the results sufficient to conclude that there is significant difference? Use a one-tailed test with = .05. Please specify (1) the t statistic, (2) the boundaries of the critical region, (3) state your decision. Show your computations for full credit

c. Compute Cohen's d.

d. Write up your results in a sentence as you would for a research paper; use APA format