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Statistics

4.) 20 rivets out 100 in a new box that we tested had break strength below the desired level. Since this is a critical part for assembly, we want to be 99% confident of how many rivets are below the desired level. Calculate the confidence interval of the percentage of rivets that are below the desired level. 5.) We expect a 1.5% response/mail rate in a particular mail campaign. We are going to test a new outer envelope with the phrase "Open me first". We would like to be accurate within 0.25% (0.0025) of the true response/mail rate for future mailings. How many mail pieces should we mail and how confident would you want to be? 6.) Write your own simple problem using the concept of Expe... click for more

Subject:

Statistics

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Posting ID:

5581

OTA ID:

101733

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Working with combinations.

I have 9 chalkboards to be distributed amongst 4 classrooms. If each class must get at least 1 chalkboard, how many possible divisions can I have?

Subject:

Statistics

Topic:

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Posting ID:

5588

OTA ID:

101733

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Statistics

#2 If i am grading the class according to your z score in a normal dist. would you rather have a score of 70 in class A where the mean is 55 and the standard deviation is 10, or a score of 80 in class B where the mean is 60 and sd of 15? What would the percentile rank be in class a@b and what does it mean to you. How would you rank a score of 50% in A@B, What would be the area under the curve between a score of 50 and 57 in class A. #3 Nationally the population for black people is .13. in our class there are two black people out of 23.A) What's the proportion of black people in our class, B) now , lets increase our class(sample) size from 23 to 230, is the proportion in our class (see... click for more

Subject:

Statistics

Topic:

All Topics

Posting ID:

5702

OTA ID:

103060

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Business Statistics

Finding the number of different combinations.

Subject:

Statistics

Topic:

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Posting ID:

5743

OTA ID:

101298

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Business Statistics

Probability Questions

Subject:

Statistics

Topic:

All Topics

Posting ID:

5744

OTA ID:

103059

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