Answer:
C
Step-by-step explanation:
x = -1 and -7
Answer:
The standard deviation has changed for the worse
Step-by-step explanation:
We need to compare the sample standard deviation of 52.3 to the known population standard deviation of 43.7. The test we will use will use Chi-Square distribution...
The hypothesis for this test are...
H0: σ = 43.7
Ha: σ ≠ 43.7
This is a 2 tailed test.
We have n = 81
s = 52.3
s² = 52.3² = 2735.29
σ = 43.7
σ² = 1909.69
The degrees of freedom are: n - 1, in this case, 80
Our significance level is 95%, so our critical values are
Χ² < 57.153 and Χ² > 106.629
The test static is found with the formula:
Χ² = [(n - 1)s²]/σ²
Plug in what we have and find the test stastic....
Χ² = [80(2735.29)]/1909.69
Χ² = 114.586
114.586 > 106.629, we reject the null hypothesis. There is evidence that shows that the standard deviation has changed. The evidence suggests that it has increased, which would make the new method worse than the old method.
Answer:
.002
Step-by-step explanation:
take the previous numbers in the pattern and divide by 3. Do this until you get to the 8th number.
The 8th number is 0.00274348422
round to the nearest thousandth for the final answer.
Hope This Helps!!
Answer:
3x-8
Step-by-step explanation:
add all the like terms.
9x+-4x+-2x=3x
6+1+-15=-8
Answer:
The number 2
Step-by-step explanation:
