× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
g
3
3
2
J
2
p
2
m
2
h
2
s
2
r
2
d
2
l
2
a
2
New Topic  
poohbazy poohbazy
wrote...
Posts: 1
Rep: 0 0
4 years ago
A sample of 51 observations will be taken from a process (an infinite population). The population proportion equals .85. The probability that the sample proportion will be between .9115 and .946 is _____.

Read 2325 times
1 Reply

Related Topics

Replies
wrote...
Educator
4 years ago
Hi poohbazy

The Answer: 0.0819 is correct.

mean = 0.85
std. error = sqrt[pq/n] = sqrt [(.85)(0.15) / 51] = 0.05

P(0.9115 < X < 0.946) = P[ (0.9115 - 0.85) / 0.05 < z < (0.946 - 0.85) / 0.05 ]

= P(1.23 < z < 1.92)

= P(z < 1.92) - P(z < 1.23) = 0.0819

Hope that helped
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  847 People Browsing
 190 Signed Up Today
Related Images
  
 193
  
 1139
  
 716
Your Opinion
Where do you get your textbooks?
Votes: 328

Previous poll results: Do you believe in global warming?