What formula to use for this Statistics problem?
A local university reports that 3% of their students take their general education courses on a pass/fail basis. Assume that fifty students are registered for a general education course What is the probability that less than four are registered on a pass/fail basis?
I'm not sure what formula to use on this type of problem.
Can anyone tell me what formula I would be using for this problem? Thanks.
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
M$3 Answers
I think this calls for a sampling distribution of proportion. Your sample proportion of interest is <=.06 (less than 4 out of 50 students).
P=.03 (population proportion)
p=.06 (sample proportion of interest)
n=50 (sample size)
z= (p-P)/SQRT(P(1-P)/n)
z= (0.06 - 0.03) / SQRT(0.03(1-0.03)/50)
Solve that z, look it up on a normal distribution table. Your answer is the area to the left of it.
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
M$There is a solution for a similar kind of problem from some website
Hope you can figure out the formula.If not I will help you more if I can
A local university reports that 20% of their students take their general education courses on a pass/fail basis. Assume that fifteen students are registered for a general education course What is the probability that less than two are registered on a pass/fail basis?
Answer:0.5491
Hope it is helpful
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
M$If so, try this:
http://en.wikipedia.org/wiki/Cumulative_distribution_function
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
M$
No, this is the reason I don't think it is a normal distribution. We just started normal distribution yesterday and we have had this homework for a while. It is over Chapter 5, normal distribution is chapter 6 homework. In chapter 5, we covered:
Random Variables
Discrete Probability Distributions
Expected Value and Variance
Binomial Probability Distribution
Poisson Probability Distribution
Hypergeometric Probability Distribution
I think it is a Binomial Probability Distribution, but I don't know how to calculate it. Hence why I want the formula.
Okay, maybe that was right. I was looking at the wrong type of table. Mine only went up to .5000, but it CAN go up to 1.000.
Statistics sucks.
i actually believe that is wrong. I check it out with my teacher and this is what we came up with:
i got .77649903 as my answer.
They are independent events and so you multiply your results
According to hackman, his homework says that 89.25% is the correct answer.
Actually that answer is wrong. The person that posted that thread is actually me LOL.
I think they were onto a total different aspect with that formula.
It seems to work for me, I worked out a z value of 1.244 which gave me the answer as a probability of ~90%
Is that not correct?
The homework is reporting the answer as not 0.8925 (is this the answer of about 90% you got?).
I don't think this is related to z-score since the sheet we have only goes up to .5000 on both sides. I had to look for another one on Google.
I think there is a different way he wants us to do this.
The answer has to be to four decimal places by the way.