How to find mean, standard devation , confedince interval 95%, t= test , pvaule and do a hypo test using data?
Short 25
Average 5
No Preference. 10
From your limited data, there is no variability measure for t-test. I wouldn't even know how to figure the mean. You might want to use chi-square test for whatever you are hypothesizing.
To use the Chi-square (X^2) method:
X^2 = ∑ (O-E)^2/E, where O = observed frequency and E = expected frequency.
∑ = sum of all the cells.
E = (column total * row total)/grand total
df = n - 1, where n = number of cells
Look up value in X^2 table in the back of your textbook.