Name: ____________________________Biostatistics BIO 206
Worksheet 2 – Confidence Intervals using the t distribution
Use the t distribution to compute precise confidence intervals below. Note that you will have to
compute the DF using the equation N-1 and look up the t value from the table of t values on the
next page:
1) Calculate the exact confidence intervals given the following values:
a) Find the 95% confidence intervals of the mean for a sample of 25 specimens with a mean of
48 and a standard deviation of 10: (4 pts)
b) Calculate the 95% CI using the data given above but use the 2SE method instead of the t
distribution method. Compare your results. How well do the two sets of CI match? (4 pts)
c) Find the 80% confidence intervals of the mean for a sample of 20 specimens with a mean of
78.3 and a standard deviation of 29.1: (4 pts)
d) Find the 90% confidence intervals for a sample of 12 specimens with a mean of 22.9 and a
standard deviation of 7.3: (4 pts)
e) Find the 99.9% confidence intervals of the mean for a sample of 30 specimens with a mean
of 14 and a standard deviation of 4.5: (4 pts)
Name: ____________________________
Biostatistics BIO 206
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