I think the answer is
No
No
Yes
But I'm not sure about the last one
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
The lamp is about 90 cm. to get this answer you take 36 and multiply it by 2.5.
Answer:
The other base measure <u>18.76</u> yd.
Step-by-step explanation:
A = h ((a+b) / 2)
213.86 = 18 ((5 + b) /2)
(5 + b) /2 = 11.88
5 + b = 23.76
<u>b = 18.76 yd</u>
