Answer:
The standard deviation of the sample mean differences is _5.23_
Step-by-step explanation:
We have a sample of a population A and a sample of a population B.
For the sample of population A, the standard deviation
is

The sample size
is:
.
For the sample of population B, the standard deviation
is

The sample size
is:
.
Then the standard deviation for the difference of means has the following form:

Finally

Answer:
Up 3 over 1
Step-by-step explanation:
Answer:
ftfft
Step-by-step explanation:
Answer:
8 is greater then -4
Step-by-step explanation: