In a normal distribution, 95% of the data fall within how many standard
2 answers:
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Answer: -3.0593
Step-by-step explanation:
The test statistic for the difference between two population mean (when population standard deviations are known ) is given by :-
where ,
= Sample sizes taken from two populations 1 and 2.
= Difference between two Sample mean.
= Standard deviations of populations 1 and 2.
As per given , we have
We assume that the data follows a normal distribution.
Then, the test statistic will be :-
Hence, the test statistic= -3.0593