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sergey [27]
3 years ago
12

A treatment is administered to a sample of n = 9 individuals selected from a population with a mean of µ = 80 and a standard dev

iation of σ = 12. After treatment, the effect size is measured by computing Cohen’s d, and a value of d = 0.50 is obtained. Based on this information, what is the mean for the treated sample??(A) M = 82(B) This cannot be answered without knowing the sample size.(C) M = 6(D) M = 86
Mathematics
1 answer:
stepan [7]3 years ago
4 0

Answer:

a) M =82

Step-by-step explanation:

Let´s study this as a Normal distribution.

As we know in a normal distribution the z score is = (X-μ)/(sd/sqrt(n))

where

X = mean for the taken sample = What we want to know in this problem

μ = Total population mean =80

sd= standard deviation= 12

n = sample size=9

So in this case z=( X-80)/(12/sqr(9))= (X-80)/4

also we know that the effect size taken by the machine is 0.5, which is the same as the z-score

so...

0.5 = (X-80)/4 => 0.5*4 = X-80

2+80 = X

X = 82

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1
MrRa [10]

Answer:

2,995 or 35,940(?)

Step-by-step explanation:

I don't exactly remember how to do this so, I'll show you two different ways I solved this

Use the formula I=P*r*t

I=Interest

P=Principal

r=rate

t=time

To solve this you'll have to...

The principal is 29,950, the rate is 5% but it'll become a decimal which is 0.05, and the time is 2

Put it into the formula form 29,950*0.05*2= 2,995 in interest

Or...

You'll use the same formula, but this time multiply 0.05 by 12 since there are 12 months in one year which is 0.6, so...

29,950*0.6*2=35,940 in interest

I hope one works!

4 0
2 years ago
There are 8 pencils in a package.Two pencils from each pack will be given to the third grade.How many packages will be needed fo
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24 times 2 pencils each student is 48 then you divide by 8 to get the number of packages needed which is 8.
7 0
2 years ago
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The length of the longest side is 17 inches.
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3 years ago
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6 0
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