Need help Urgently, Easy question Find x.
2 answers:
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Answer:
The 95 percent confidence interval for the true mean metal thickness is between 0.2903 mm and 0.2907 mm
Step-by-step explanation:
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of .
So it is z with a pvalue of , so
Now, find the margin of error M as such
In which is the standard deviation of the population and n is the size of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is 0.2905 - 0.0002 = 0.2903 mm
The upper end of the interval is the sample mean added to M. So it is 0.2905 + 0.0002 = 0.2907 mm
The 95 percent confidence interval for the true mean metal thickness is between 0.2903 mm and 0.2907 mm
Answer:
Please look at the graph attached to find the x axis and y axis...
a) it has a postive association (becuase of the increment of the trendline)
b) it is linear becuase it is increased from the 0 value and up)
c) there is a outlier in the graph as you can see about four hours the GPA increased by 3.2 then back to 2.5
Hope this helps!!!
