Any one with Math skills?

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bangerang103

bangerang103

Feeder Fish
MFK Member
Jun 26, 2007
435
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Long Island NY
a statistics problem I need help with I have the first answer that needs z scores~ any help!



Scores for men on the verbal portion of the SAT test are normally distributed with a mean 509 and a standard deviation of 112. Randomly selected men are given the Columbia Review Course before taking the SAT test. Assume that the course has no effect.

A: If 1 of the men is randomly selected, find the probability that his score is at least 590.

B: If 16 of the men are reandomly selected, find the probability that their mean score is at least 590.

C: In finding the probability for part(B), why can't the central limit theorum be used even though the sample size does not exceed 30?

D: If the random sample of 16 men does result in the mean score of 590, is there strong evidence to support the claim that the course is cactually effective, why or why not?


Thank you so much to anyone who helps. I appreciate it.
 
thanks john! I even have to graph it, I have most of that and think im almost done. ANY more help is great. you need to show full work how you got the answer too!


its due tommorow at 930~
 
You still have 12 hours to crack this. I suggest either, find someone who has done it, and straight out copy him, or just have a shot in the dark but do give it a go.
 
all you need to do is look at what the z score formula is, you get two numbers from off the graph you divide one by the other and you should get your answer (if I remeber correctly) Its been a year sence I took it but you might want to look for it, should be in the book.
 
I did ok was just gonna check my answers it was being graded. 87 for not showing work because shes crazy... ( And i used the wrong "wording" )


:nilly:

thanks ashhhhh
 
Ash;1746198; said:
all you need to do is look at what the z score formula is, you get two numbers from off the graph you divide one by the other and you should get your answer (if I remeber correctly) Its been a year sence I took it but you might want to look for it, should be in the book.
Click to expand...


go ash :headbang2:headbang2:headbang2
 
bangerang103;1746447; said:
I did ok was just gonna check my answers it was being graded. 87 for not showing work because shes crazy... ( And i used the wrong "wording" )


:nilly:

thanks ashhhhh
Click to expand...


not bad for a first try :popcorn::popcorn::popcorn:
 
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