Answer:
The 95% confidence interval estimate for the population mean life of compact fluorescent light bulbs in this shipment is between 7,255 hours and 7,745 hours.
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 7500 - 245 = 7255 hours.
The upper end of the interval is the sample mean added to M. So it is 7500 + 245 = 7745 hours.
The 95% confidence interval estimate for the population mean life of compact fluorescent light bulbs in this shipment is between 7,255 hours and 7,745 hours.
Answer:
x= 20 i think sorry if it's wrong⊙﹏⊙
I believe the answer is 0.5
The inference that can be made about the results is that; energy drinks enhances performance during 100 meters race.
<h3>
How to find inference from a given data?</h3>
From the given table and histogram, we can see that;
Group 1 average race time = 10.8
Group 2 average race time = 11.6
Thus, since group 1 drank energy drink and had faster times than group 2 without energy drinks, the inference that can be made about the results is that energy drinks has enhancing performance during 100 meters race.
Read more about Inference at; brainly.com/question/1611703
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Answer: 97ft
Step-by-step explanation:
20+20= 40
30-3=27
40+30= 70
70+27= 97ft