(-3.1)²×(2.6-5.3)+ 9.32
1 answer:
9514 1404 393
Answer:
-16.627
Step-by-step explanation:
It works well to use a calculator to evaluate this expression.
__
= 9.61×(-2.7) +9.32 . . . . . . evaluate the difference first, then the square
= -25.947 +9.32 . . . . . . . perform the multiplication
= -16.627 . . . . . . . . . . . . finally, do the addition
You might be interested in
Answer:
There is not sufficient evidence to support the claim that the technique performs differently than the traditional method.
Step-by-step explanation:
The null hypothesis is:
The alternate hypotesis is:
The test statistic is:
In which X is the sample mean, is the value tested at the null hypothesis,
is the standard deviation and n is the size of the sample.
A researcher used the technique with 260 students and observed that they had a mean of 94 hours. Assume the standard deviation is known to be 6.
This means, respectively, that
The test-statistic is:
The pvalue is:
2(P(Z < -2.69))
P(Z < -2.69) is the pvalue of Z when X = -2.69, which looking at the z-table, is 0.0036
2*(0.0036) = 0.0072
0.0072 < 0.01, which means that the null hypothesis is accepted, that is, there is not sufficient evidence to support the claim that the technique performs differently than the traditional method.