The following results are for independent random samples taken from two populations. Sample 1 Sample 2 n1 = 20 n2 = 30 x1 = 22.7 x2 = 20.1 s1 = 2.4 s2 = 4.2 (a) What is the point estimate of the difference between the two population means? (Use x1 − x2.)   (b) What is the degrees of freedom for the t distribution? (Round your answer down to the nearest integer.)

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The following results are for independent random samples taken from two populations.
Sample 1 Sample 2
n1 = 20
n2 = 30
x1 = 22.7
x2 = 20.1
s1 = 2.4
s2 = 4.2
(a)
What is the point estimate of the difference between the two population means? (Use
x1 − x2.)
 
(b)
What is the degrees of freedom for the t distribution? (Round your answer down to the nearest integer.)
 
(c)
At 95% confidence, what is the margin of error? (Round your answer to one decimal place.)
 
(d)
What is the 95% confidence interval for the difference between the two population means? (Use
x1 − x2.
Round your answers to one decimal place.)
_____to______

 

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