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:
1) 8= (5xW)+(3xW) (she worked 8 hours total over spread of two days)
2) 8=8xW (he worked 8 hours total over one day)
3) Yes, they worked the same number of hours, they just worked for an different amount of hours.
Step-by-step explanation:
I kind of explained it in the answer, but if you'd like a clarification.
Answer:
b =
✔ 24
d =
✔ 10
f =
✔ 32
g =
✔ 34
h =
✔ 46
Step-by-step explanation:
please mark brainlest
Answer:
The answer to your question is: 30 gallons / h
Step-by-step explanation:
Convert 2 quart/ min to gallons per hour
= 30 gallons /h
Answer:
2 1/5
2 X 5 + 1 = 11/5
11/5 X 2/1 = 22/5
1 3/4
1 X 4 + 3 = 7/4
7/4 X 2/1 = 14/4
22/5 + 14/4
5 X 4 = 20
4 X 22 = 88
5 X 14 = 70
88/20 + 70/20 = 158/20
20 goes into 158 7 times with 18 left over
7 18/20 simplified = 7 9/10