8.52
Determine the sample size necessary under the following conditions.
a) To estimate µ with = 44, E = 3, and 95% confidence
b) To estimate µ with a range of values from 20 to 88 with E = 2 and 90% confidence
c) To estimate p with p unknown, E = 0.04, and 98% confidence
d) To estimate p with E = 0.03, 95% confidence, and p thought to be approximately 0.70
a) To estimate µ with = 44, E = 3, and 95% confidence
95% è 4750
z = 1.96 from Table A.5
b) To estimate µ with a range of values from 20 to 88 with E = 2 and 90% confidence
z = 1.645 (From Table A.5; using 4500)
E = 2
The sample size is rounded up to 196.