Question
The average undergraduate cost per tuition, fees, room, and board for all institutions last year was $26,025. A random sample of 40 institutions of higher learning this year indicated that the mean tuition, fees, room, and board for the sample was $27,690, and the population standard deviation is $5492. At the 0.05 level of significance, is there sufficient evidence that the cost has increased? (Remember to follow the steps in hypothesis testing)
99
likes495 views
Answer to a math question The average undergraduate cost per tuition, fees, room, and board for all institutions last year was $26,025. A random sample of 40 institutions of higher learning this year indicated that the mean tuition, fees, room, and board for the sample was $27,690, and the population standard deviation is $5492. At the 0.05 level of significance, is there sufficient evidence that the cost has increased? (Remember to follow the steps in hypothesis testing)
Gerhard
4.593 Answers
The null hypothesis:
\mu=26025 , Then the mean cost is the same as the alternative hypothesis:
\mu\gg\:26025 , the mean cost has increased
t=\frac{\left(barx-\mu\right)}{\left(\frac{\sigma}{\sqrt{n}}\right)}=\frac{\left(27690-26025\right)}{\left(\frac{5492}{\sqrt{40}}\right)}=1.917
df=40-1=39
using a t-score calculator p-value = 0.0313
Since the p-value < 0.05, we reject the null hypothesis.
Therefore, the cost has increased.
Frequently asked questions (FAQs)
Find the x-intercept of the reciprocal function f(x) = 1/x.
+
What is the probability of getting at least 3 heads in 6 coin flips?
+
What is the output of the function f(x) = 3x^2 + 5x - 2 for x = 4?
+
New questions in Mathematics