Answer:
Step-by-step explanation:
The formula for determining the confidence interval for the difference of two population means is expressed as
Confidence interval = (x1 - x2) ± z√(s²/n1 + s2²/n2)
Where
x1 = mean sale amount for mail order sales = 82.70
x2 = mean sale amount for internet sales = 66.9
s1 = sample standard deviation for mail order sales = 16.25
s2 = sample standard deviation for internet sales = 20.25
n1 = number of mail order sales = 17
n2 = number of internet sales = 10
For a 99% confidence interval, we would determine the z score from the t distribution table because the number of samples are small
Degree of freedom =
(n1 - 1) + (n2 - 1) = (17 - 1) + (10 - 1) = 25
z = 2.787
Margin of error =
z√(s²/n1 + s2²/n2) = 2.787√(16.25²/17 + 20.25²/10) = 20.956190
Answer:
l and n are parallel
Step-by-step explanation:
360° around a point
65° x 2 = 130
360 - 130 = 230
230/2 = 115
115 ° are corresponding angles
Answer: 33554432
Step-by-step explanation:
8 x (2 ^ (23 - 1)) = 33554432
Answer:
1274Dac
Step-by-step explanation:
i used photomath but i think thats right hope this helps:)
