How would i write y= -7x+25 In Standard form? please help:)
2 answers:
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Answer:
The mean life of a large shipment of CFL bulbs is equal to 7,520 hours.
Step-by-step explanation:
The quality control manager wants to determine whether the mean life of a large shipment of CFL bulbs is equal to 7,520 hours.
The quality control manager can use a one-sample test to determine whether the mean life is 7,520 hours or not.
The hypothesis can be defined as follows:
<em>H₀</em>: The mean life of a large shipment of CFL bulbs is equal to 7,520 hours, i.e. <em>μ</em> = 7520.
<em>Hₐ</em>: The mean life of a large shipment of CFL bulbs is different from 7,520 hours, i.e. <em>μ</em> ≠ 7520.
The information provided is:
As the population standard deviation is provided, we will use a <em>z</em>-test for single mean.
Compute the test statistic value as follows:
The test statistic value is -1.31.
Decision rule:
If the <em>p</em>-value of the test is less than the significance level then the null hypothesis will be rejected.
Compute the <em>p</em>-value for the two-tailed test as follows:
*Use a <em>z</em>-table for the probability.
The <em>p</em>-value of the test is 0.1902.
The <em>p</em>-value of the test is very large for all the commonly used significance level. The null hypothesis will not be rejected.
Thus, it can be concluded that the mean life of a large shipment of CFL bulbs is equal to 7520 hours.
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Answer:
x = 3
Step-by-step explanation:
You can forget about point R. It does not have any part in this problem, except to add confusion.
The given line PQ has the same y-coordinate values for points P and Q. This means the segment is a horizontal segment. Its perpendicular bisector will be a vertical line through its midpoint.
The midpoint (M) of PQ is ...
M = (P +Q)/2
M = ((-2, 2) +(8, 2))/2 = (-2+8, 2+2)/2 = (6, 4)/2
M = (3, 2)
The vertical line through a point with x-coordinate 3 will have the equation ...
x = 3
