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barmour44 barmour44
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Posts: 420
4 years ago
A professor at a large university believes that students take an average of 15 credit hours per term. A random sample of 24 students in her class of 250 students reported the following number of credit hours that they were taking:



Does this sample indicate that students are taking more credit hours than the professor believes? Test an appropriate hypothesis and state your conclusion.
Textbook 
Stats: Modeling the World

Stats: Modeling the World


Edition: 4th
Authors:
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Kailz1218Kailz1218
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4 years ago
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barmour44 Author
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4 years ago
Helps a lot... Now I'm ready for my quiz
wrote...
4 years ago
A professor at a large university believes that students take an average of 15 credit hours per term. A random sample of 24 students in her class of 250 students reported the following number of credit hours that they were taking:



Find a 95% confidence interval for the number of credit hours taken by the students in the professor's class. Interpret your interval.
wrote...
4 years ago
With the conditions satisfied (from Problem 1), we can find a t-interval for mean credit hours.
We know: n = 24, = 16.6 , and s = 2.22 . So, SE() = = 0.453.
Our confidence interval has the form ± t*n-1 .  We have t*23 = 2.069.  Our 95% confidence interval is then 16.6 ± 2.069 = 16.6 ± 0.94, or 15.66 to 17.54.

We are 95% confident that the interval 15.66 to 17.54 contains the true mean number of credit hours that students in the professor's class are taking.
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