Refer to the TwoSamleTTest tab in the assignment spreadsheet. Answer the followi
ID: 3022926 • Letter: R
Question
Refer to the TwoSamleTTest tab in the assignment spreadsheet. Answer the following questions:
Which group of subject is least alike with regard to weight? Do the two groups have significantly differnt mean weights?
t-Test: Two-Sample Assuming Equal Variances Wt_Grp_1 Wt_Grp_2 Mean 182.3478 183.1111 Variance 350.1462 414.8718 Observations 23 27 Pooled Variance 385.2059 Hypothesized Mean Difference 0 df 48 t Stat -0.13706 P(T<=t) one-tail 0.44578 t Critical one-tail 1.677224 P(T<=t) two-tail 0.891559 t Critical two-tail 2.010635Explanation / Answer
Group 2 has a higher variability in weights as it has a higher variance.
For comparing between 2 groups, we look at the P-Value of the 2 tailed t-test, which is 0.891559
As this value is more than the 5% level of significance (0.05), we fail to reject the hypothesis that the 2 groups have different weights.
Answer: the two groups do not have significantly differnt mean weights