Question

Find the 95% confidence interval for the difference between two means based on this information about two samples. Assume independent samples from normal populations. (Use conservative degrees of freedom.) (Give your answers correct to two decimal places.)

Sample	Number	Mean	Std. Dev.
1	21	34	29
2	25	23	27

Lower Limit
Upper Limit

Answer 1

Mean1 = 34

Sample size1 (n1) = 21

Standard deviation1 (s1) = 29

Mean2 = 23

Sample size2 (n2) = 25

Standard deviation2 (s2) = 27

Confidence interval(in %) = 95

Since we know that

Required confidence interval = (11.0-16.6487, 11.0+16.6487)

Required confidence interval = (-5.6487, 27.6487)

Lower Limit	-5.6487
Upper Limit	27.6487

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