Question

Water Land b/w independent measures t test One group of participants was expected to perform a memory task under water and a second group of participants was expected to perform a memory task on land. 82 84 76 85 86 The data for memory accuracy scores are shown to the right in column Rand S, respectively) 83 80 75 79 78 86 82 Determine the following: 82 82 84 86 Use the appropriate two-tailed statistical test and an alpha level of .05 to determine whether the difference in memory accuracy for the two groups is statistically significant 82 80 82 82 What is the obtained t-value? 82 82 18 What is the exact p-value (significance level) obtained? 86 83 83 84 How many total df? 85 What is the 95% confidence interval? 80 81 76 85 85 84 86 85 Report the results from the statistical test as though you were reporting it in a published journal article 85

Answer 1

Using Minitab statistical software for this data

we used here independent two-sample t-test:

Two-Sample T-Test and CI: water, land

Two-sample T for water vs land

N Mean StDev SE Mean
water 20 80.45 3.28 0.73
land 20 83.95 1.57 0.35

Difference = μ (water) - μ (land)
Estimate for difference: -3.500
95% CI for difference: (-5.171, -1.829)
T-Test of difference = 0 (vs ≠): T-Value = -4.30 P-Value = 0.0002 DF = 27

1) Here we used the independent t-test

2) T value ( two tail)=-4.30

3) P-value ( two tail)=0.0002

4) Degree of freedom: 27

5)95% CI for difference: (-5.171, -1.829)

6)Conclusion:

0.0002<0.05 so there is statistical difference between this two treatment water and land