Ssw All
Jenny studies a sample randomly drawn from a population who all took a course in increasing?
Jenny studies a sample (n = 12) randomly drawn from a population who all took a course in increasing self-esteem. She wanted to see if after the course, students really made a number of new friends as the course had advertised. Six months after the end of the course, the number of new friends among the 12 participants ranged from 0 to 20 with a mean of 10.00. The sum of the squared deviations around the sample mean (SSw) equaled 99.00. Jenny then transformed her findings to t scores. Tom’s transformed score was t=3.00. How many new friends had he made?
s^2 = SS / df = 99/11 = 9 (sample variance)
s = sqrt(s^2) = sqrt(9) = 3 (sample standard deviation)
t = (X - mu) / s (Student's t, by definition)
We are given t = 3, mu = 10, and we know s = 3
so 3 = (X - 10) / 3
X = 19 new friends
This question is a silly use of the t-formula but you can tell the answer is correct because your instructor helpfully made all the fractions and square-roots come out to whole numbers.
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FLIGHT '77 V/A Comp BAHA'I R&B/FOLK/SSW All Orig Rare PRIVATE LP $25.00 |
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