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Statistics Help!

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KRASHED
Posts: 7803 - Karma: 466
Got an exam on monday in statistics. A group of three of us are studying and starting to burn out.

Here's a question we need help with. +K for answer

According to one estimate, only 13% of Canadian start up businesses survive their first year. What is the probably that at least one among 10 recent start of businesses will survive their first year?

a).2484
b).3172
c).7516
d).999

Our current guess in answer D just based on the likelyhood of at least one business surviving when 13/100 are estimated to survive.

Apr 21 2012 2:36PM
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KRASHED
Posts: 7803 - Karma: 466
There's 78 practice questions, likely going to need help with a few more. I will post up more problem ones as they come along. Always +K for help.

How you came about the answer would be appreciated.
Apr 21 2012 2:38PM
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thenightman
Posts: 766 - Karma: 132
It's C
Apr 21 2012 2:48PM
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O-A_s
Posts: 373 - Karma: 58
http://stattrek.com/online-calculator/binomial.aspx

Based on this I would say c: 0.75 because this is a situation of binomial probability if I am correct and P(at least 1)=1-P(none) which I think is the same as that bottom one in the link.
Apr 21 2012 2:49PM
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thenightman
Posts: 766 - Karma: 132
yeah you can get a program like that on your calculator called binprob. That's how I did it.
Apr 21 2012 2:51PM
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blackmamba.
Posts: 969 - Karma: 56
C) 75.16%

binomial distribution
Apr 21 2012 4:25PM
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KRASHED
Posts: 7803 - Karma: 466
Thanks to all who have answered so far


Another question (regression related)
The width of a prediction interval is the same for all values of x
a) True
b) False

Apr 21 2012 4:48PM
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soulskier
Posts: 17805 - Karma: 3,821
this would appear to be one of the seven percent of homework help threads that doesn't go right down the shitter
Apr 21 2012 6:26PM
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Bear_Grylls
Posts: 1223 - Karma: 300
if x is the number in the sample then false. it becomes more normal as N or X gets bigger
Apr 21 2012 6:31PM
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