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carryislarrywithdair
28.08.2019 •
Mathematics
Question 6 -the black with 3 points)
16.03
how many variadie terms are in the expression 3y +54 +y + 9? input a numeric value only.)
numerical answers expected
answer for blank 1
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Ответ:
$16,341< μ <$22,459.
Step-by-step explanation:
The formula for calculating confidence interval is expressed as;
CI = xbar±(z×s/√n)
xbar is the mean tuition
z is the z score at 90% CI
s is the standard deviation
n is the sample size
Given
xbar = $19,400
s = $11,000
n = 35
z = 1.645
Substitute into the formula for calculating confidence interval
CI = xbar±(z×s/√n)
CI = 19400±(1.645×11000/√35)
CI = 19400±(1.645×11000/5.916)
CI = 19400±(1.645×1859.36)
CI = 19400±3058.65
CI = [19400-3,058.65, 19400+3,058.65]
CI = [16,341.35, 22,458.65]
CI = [16,341, 22,459] to nearest whole number.
Hence a 90% confidence interval for the mean tuition for all colleges and universities is 16,341< μ <22,459.