Sample mean
Sample standard deviation
Sample size n = 25
Significance level = 1- 90/100 = 0.1
Since, population sd is unknown we will use
t-critical value at 90% confidence level which is:
/* we can find it using excel function: =T.INV(0.1/2,24) */
Confidence Interval for is:
Therefore,
ans.
1o) A simple random sample of size n is drawn! from a population that is normally...
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