A community for students. Sign up today!
Here's the question you clicked on:
 0 viewing
 one year ago
Last year, there were 30,000 students at a university; their GPA had a mean of 2.9 and an SD of 0.6. This year, in a simple random sample of 100 students taken from this university, the GPAs have a mean of 2.95 and an SD of 0.55. Has the mean GPA at the university gone up since last year, or is this just chance variation?
onesample z = (2.95  2.9)/0.06 = 0.833; P large; conclude chance variation onesample z = (2.95  2.9)/0.055 = 0.909; P large; conclude chance variation twosample z = (0.05  0)/sqrt(0.055^2 + 0.0035^2) = 0.907; P large;
 one year ago
Last year, there were 30,000 students at a university; their GPA had a mean of 2.9 and an SD of 0.6. This year, in a simple random sample of 100 students taken from this university, the GPAs have a mean of 2.95 and an SD of 0.55. Has the mean GPA at the university gone up since last year, or is this just chance variation? onesample z = (2.95  2.9)/0.06 = 0.833; P large; conclude chance variation onesample z = (2.95  2.9)/0.055 = 0.909; P large; conclude chance variation twosample z = (0.05  0)/sqrt(0.055^2 + 0.0035^2) = 0.907; P large;

This Question is Closed
Ask your own question
Ask a QuestionFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.