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Hello. How was the exponential growth formula proven in the applications of population dynamics (A = Aoekt where A is the final population, Ao is the initial population, k is a constant, and t is time) and of finance (A = Aoert, A is today's value, Ao was the initial value, r is the interest rate, and t is time)? Thanks in advance. -- Mayfare ( talk) 02:29, 19 April 2010 (UTC)
In my statistics class we are taught for a chi-square test (I am not sure which type as only when looking up the article did I find there were multiple types, but I assume it is the Pearson test), the expected values are equal to the row total multiplied by the column total, divided by the table total. i.e for a table that read A B C D The expected value for the square of A would be (A+B)*(C*D)/(A+B+C+D). Why is this the case? From what I understand, each value should be represented in equal proportion, but I can't see how that relates to these expected values. Thanks! 66.133.196.152 ( talk) 05:16, 19 April 2010 (UTC)
hi guys,i want to know what is the correct definition of "real numbers". to find whether "a" is a real number or not,we say if a∧2 is greater than 0 ,a∈R. when we take √-2⇒(√-2)^2 so it is -2 so √-2∉R. But if we do like this,√-2⇒ (√-2)^2 ,so (√-2 × √-2)= √(-2×-2) and then , √4 =2 so, √-2∈R. ?????? i simply know that it can't be. so want to know where i was wrong. Thanks. —Preceding unsigned comment added by Coolerking.dany ( talk • contribs) 17:51, 19 April 2010 (UTC)
thanks guys.i think i know where i was wrong. —Preceding unsigned comment added by Coolerking.dany ( talk • contribs) 02:51, 20 April 2010 (UTC)
Does ? 131.111.248.99 ( talk) 22:55, 19 April 2010 (UTC)
Mathematics desk | ||
---|---|---|
< April 18 | << Mar | April | May >> | April 20 > |
Welcome to the Wikipedia Mathematics Reference Desk Archives |
---|
The page you are currently viewing is an archive page. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages. |
Hello. How was the exponential growth formula proven in the applications of population dynamics (A = Aoekt where A is the final population, Ao is the initial population, k is a constant, and t is time) and of finance (A = Aoert, A is today's value, Ao was the initial value, r is the interest rate, and t is time)? Thanks in advance. -- Mayfare ( talk) 02:29, 19 April 2010 (UTC)
In my statistics class we are taught for a chi-square test (I am not sure which type as only when looking up the article did I find there were multiple types, but I assume it is the Pearson test), the expected values are equal to the row total multiplied by the column total, divided by the table total. i.e for a table that read A B C D The expected value for the square of A would be (A+B)*(C*D)/(A+B+C+D). Why is this the case? From what I understand, each value should be represented in equal proportion, but I can't see how that relates to these expected values. Thanks! 66.133.196.152 ( talk) 05:16, 19 April 2010 (UTC)
hi guys,i want to know what is the correct definition of "real numbers". to find whether "a" is a real number or not,we say if a∧2 is greater than 0 ,a∈R. when we take √-2⇒(√-2)^2 so it is -2 so √-2∉R. But if we do like this,√-2⇒ (√-2)^2 ,so (√-2 × √-2)= √(-2×-2) and then , √4 =2 so, √-2∈R. ?????? i simply know that it can't be. so want to know where i was wrong. Thanks. —Preceding unsigned comment added by Coolerking.dany ( talk • contribs) 17:51, 19 April 2010 (UTC)
thanks guys.i think i know where i was wrong. —Preceding unsigned comment added by Coolerking.dany ( talk • contribs) 02:51, 20 April 2010 (UTC)
Does ? 131.111.248.99 ( talk) 22:55, 19 April 2010 (UTC)