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Author Question: Thirty percent of a magazine's subscribers are female. A random sample of 50 subscribers is taken. ... (Read 92 times)

Jramos095

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on: Jun 24, 2018
Thirty percent of a magazine's subscribers are female. A random sample of 50 subscribers is taken. Answer the following questions using Excel:
 a. What is the probability that the proportion of females from this sample is at most .25?
  b. What is the probability that the proportion of females from this sample is between .22 and .28?
  c. What is the probability that the proportion of females from this sample is within .03 of the population proportion?

Question 2

Given that z is a standard normal random variable, what is the value of z if the area to the right of z is .1401?
 a. 1.08
  b. .1401
  c. 2.16
  d. 1.08


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djpooyouma

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Reply #1 on: Jun 24, 2018
Answer to Question 1

a. .220
=NORM.DIST(0.25,0.3,0.0648,TRUE)
b. .270
=NORM.DIST(0.28,0.3,0.0648,TRUE)  NORM.DIST(0.22,0.3,0.0648,TRUE)
c. .357
=NORM.DIST(0.33,0.3,0.0648,TRUE)  NORM.DIST(0.27,0.3,0.0648,TRUE)

Answer to Question 2

a


Jramos095

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Reply 2 on: Jun 24, 2018
Wow, this really help

mjenn52

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Reply 3 on: Yesterday
Excellent

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