Question

So Dr. Chu finally decided to conduct his study on the impact coffee has on academic performance. He wanted to see if varying the amount of coffee a student consumes will change how well or bad they did on an exam. The results of his study is summarized in the table above.

Determine the SS for Within-Treatment (SSWT)

COFFEE

1 oz = 51 47 55

2 oz= 77 51 65

3 oz= 53 41 61

4 oz= 93 93 95

Answer 1

mean for group 1 = (sum of data values)/(sample size) =  (51+47+55)/3 = 51

mean for group 2 = (sum of data values)/(sample size) =  (77+51+65)/3 = 64.33

mean for group 3 = (sum of data values)/(sample size) =  (53+41+61)/3 = 51.67

mean for group 4 = (sum of data values)/(sample size) =  (93+93+95)/3 = 93.67

SSWT calculation