× Didn't find what you were looking for? Ask a question
  
  
Top Posters
Since Sunday
p
29
29
C
18
I
13
n
13
a
12
11
C
11
s
11
11
m
11
10
New Topic  
wrote...
Posts: 205
2 weeks ago
A college alumni fund appeals for donations by phoning or emailing recent graduates. A random sample of 300 alumni shows that 40% of the 150 who were contacted by telephone actually made contributions compared to only 30% of the 150 who received email requests. Which formula calculates the 98% confidence interval for the difference in the proportions of alumni who may make donations if contacted by phone or by email?

▸ (0.40 - 0.30) ± 2.33

▸ (0.40 - 0.30) ± 2.33

▸ (0.40 - 0.30) ± 2.33

▸ (0.40 - 0.30) ± 2.33

▸ (0.40 - 0.30) ± 2.33
Textbook 

Stats: Modeling the World


Edition: 4th
Authors:
Read 42 times
1 Reply

Related Topics

Replies
wrote...
2 weeks ago
(0.40 - 0.30) ± 2.33
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers.
Learn More
Improve Grades
Help Others
Save Time
Accessible 24/7
  139 People Browsing
 102 Signed Up Today
Your Opinion
Do you believe in global warming?
Votes: 186

Related Images
 744
 138
 111