For sample mean x = 80, sample size n = 36 and sample standard deviation s = 24
ID: 3431947 • Letter: F
Question
For sample mean x = 80, sample size n = 36 and sample standard deviation s = 24
find 90% confidence interval for population mean.
This is the case when population standard deviation is not known.
Use formula on page 328 with t-value.
Find t-value in Appendix Table IV.
Tip: For confidence level 90% ? = 1 - 0.90 = 0.10, ?/2 = 0.10/2 = 0.05
So, in Table IV use column t0.05 and line with df = n - 1 = 36 - 1 = 35.
from 65.48 to 95.86
from 75.44 to 82.16
from 73.24 to 86.76
from 70.18 to 88.65
from 65.48 to 95.86
from 75.44 to 82.16
from 73.24 to 86.76
from 70.18 to 88.65
Explanation / Answer
from 75.44 to 82.16
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