× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
d
6
M
5
a
5
o
5
m
4
J
4
M
4
s
4
s
4
a
4
g
4
c
4
New Topic  
amy99 amy99
wrote...
Posts: 2
Rep: 0 0
9 years ago Edited: 9 years ago, amy99
A professor believes the students in a statistics class this term are more creative than most other students attending the university. A previous study found that students at the university had a mean score of 35 on a standard creativity test, and the current class has an average score of 40 on this scale with an estimated population standard deviation of 7. The standard deviation of the distribution of means is 1.63.
 
 

Post Merge: 9 years ago

I am looking for the t score and the effect size
Read 1109 times
2 Replies

Related Topics

Replies
wrote...
9 years ago
Effective size is 0.71
wrote...
Staff Member
9 years ago
Let X = the current class average score.
 
 
t-score: t = (X - μ) / (σ/√n) = (40 - 35) / 1.63 = 3.07
 
 
This is over 3 standard deviations away, so it gives support to the professor's belief that the students are more creative than other classes.
 
 
effect size: (X - μ) / σ = (40 - 35) / 7 =  0.714
Ask another question, I may be able to help!
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  1499 People Browsing
 110 Signed Up Today
Related Images
  
 295
  
 321
  
 203
Your Opinion
Who will win the 2024 president election?
Votes: 119
Closes: November 4

Previous poll results: Who's your favorite biologist?