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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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makkiz [27]
1/5= 20%
35×20%= 7. Alice has seven cars
4 0
3 years ago
Jake is 2 5 25 years old. Next year, he'll be 2 6 26 years old. What is the percentage increase in Jake's age from last year?
kramer

Answer:

4%

Step-by-step explanation:

We have been given that  Jake is 25 years old. Next year, he'll be 26 years old.

To find the percentage increase in Jake's age from last year, we will use percentage decrease formula as our original value is less than new value.

\text{Percentage decrease}=\frac{\text{Original-New}}{\text{Original}}*100

Now let us substitute our given values in above formula.

\text{Percentage decrease in Jake's age from last year}=\frac{25-26}{25}*100  

\text{Percentage decrease in Jake's age from last year}=\frac{-1}{25}*100  

\text{Percentage decrease in Jake's age from last year}=-1*4=-4  

Since our answer is a negative number then this is a percentage increase.

Therefore, there is 4% increase in Jake's age from last year.

7 0
3 years ago
Read 2 more answers
Excursion boat on the river takes 2 1/2 hours to make the trip to a point 12 miles upstream and to return if the rate at which t
Mama L [17]

Answer:

Let the current speed be "c";

Then the boat speed in still wate is "5c":

-----------------------

Upstream speed:

distance = 12 miles ; rate = 5c-c = 4c mph ; time = 12/4c = 3/c hrs

---------------------------

Downstream speed:

distance = 12 miles ; rate = 5c+c = 6c mph ; time = 12/6c = 2/c hrs

Step-by-step explanation:

Equation:

time + time = 2 1/2 hrs

3/c + 2/c = 5/2

Multiply thru by 2c to get:

6 + 4 = 5c

c = 2 mph (speed of the current)

5c = 10 mph (speed of the boat in still water)

3 0
2 years ago
Y=2x-2 and 4x+2y=12. solve the equation PLEASE SHOW WORK​
diamong [38]
<h3>The solution as an ordered pair is (x,y) = (2,2)</h3><h3>x = 2 and y = 2 pair up together.</h3>

===============================

Work Shown:

4x+2y = 12

4x+2( y ) = 12

4x+2( 2x-2 ) = 12 ... replace y with 2x-2

4x+2( 2x ) + 2( -2 ) = 12 ... distribution rule

4x+4x-4 = 12

8x-4 = 12

8x-4+4 = 12+4 ... add 4 to both sides

8x = 16

8x/8 = 16/8 ... divide both sides by 8

x = 2 is the first part of the answer

Use x = 2 to find y

y = 2x-2

y = 2(2)-2 ... replace x with 2

y = 4-2

y = 2 is the second part of the answer

8 0
3 years ago
Read 2 more answers
I need help people help me
sineoko [7]

Answer:

87

Step-by-step explanation:

all the angles of a triangle out of 180 so subtract the two numbers you have from 180

8 0
2 years ago
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