Which is greater than 4: (a) 5 or (b) 5?
2 answers:
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Answer: a. 19.200 to 20.800
Step-by-step explanation:
Formula to find the confidence interval :-
, where n is the sample size
= Population standard deviation.
= Sample mean
= Two tailed z-value for significance level of
.
Given : Confidence level = 95.44% = 0.9544
Significance level =
Using standard normal z-value table ,
Two tailed z-value for Significance level of 0.0456 :
Also,
n=144
Then, the required 95.44% confidence interval for the population mean :-
Hence, the 95.44% confidence interval for the population mean is <u>19.200 to 20.800</u>.