please use z table for question number 1. Document Preview: UIC Sydney Quantitative Methods Assignment 30% of the course grade. Due Date: Thursday, 17 January, 2013 at the beginning of your class....

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Answered Same DayDec 21, 2021

Answer To: please use z table for question number 1. Document Preview: UIC Sydney Quantitative Methods...

David answered on Dec 21 2021
118 Votes
a)The proportion of sales greater than $21500.We standardize first and thus
we need P(Z>(21500-22000)/3300)=
P( Z>-0.1515)





The arrows in the graph tells us that we need the area to the right side of the line.
This area is 56.02% .
Thus the proportion of sales greater than 21500 is 56.02%.

b) The proportion of sales less than $21,000 per month.

We again standardize first .Thus we need the following :
P(Z<(21000-22000)/3300)
=P(Z<-0.303)

Looking at the curve,


-6 -4 -2 0 2 4 6
-6 -4 -2 0 2 4 6

The arrows tell us that we need the area to the left of the line.
The required area from the Z table is 38.1%
Thus the proportion of sales less than 21000 is 0.381.

c) The proportion of sales between $22,500 and $24,500

After standardizing, we need P(0.1515




We need the area between the 2 lines and from the Z table, the required area is
21.54% .
Thus the required proportion is 0.2154.

Q2.
Chi square test :Also known as the pearson chi square test , is used for goodness
of fit or checking for...
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