Use the standard deviation values of the two samples to find the standard deviation of the sample mean differences.
Sample Standard Deviation
Red box 3.868
Blue box 2.933
Then complete each statement.
The sample size of the session regarding the number of people would purchase the red box,
Ni, is
a)63
b)48
c)45
d)60
The sample size of the session regarding the number of people would purchase the blue
box, N2, is
a)45
b)48
c)63
d)60
The standard deviation of the sample mean differences is approximately
a) 0.53
b)0.72
c)0.62
d)0.69

plz come here

Step-by-step explanation:

et.gggy-nmnm-xvk

w

step-by-step explanation:

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".