Answer:
The sample mean is
b.3.55
The margin of error is
0.32
Step-by-step explanation:
Deep explanation about a confidence interval
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 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 mean subtracted by M. So it is 6.4 - 0.3944 = 6.01 hours.
The upper end of the interval is the mean added to M. So it is 6.4 + 0.3944 = 6.74 hours.
In this problem:
The deep explanation is not that important.
We just have to recognize that the interval has a lower end and an upper end. The distance from both the upper and the lower end to the mean is M. This means that the sample mean is the halfway point between the lower end and the upper end.
The margin of error is the distance of these two points(lower and upper end) to the mean.
In our interval
Lower end: 3.23
Upper end: 3.87
Sample mean
So the correct answer is:
b.3.55
The margin of error is
3.87 - 3.55 = 3.55 - 3.23 = 0.32
Answer:
20% of $886.20 is 177.24 so the better deal would be 20% off
Step-by-step explanation:
Answer:
Classical probability
Step-by-step explanation:
- Classical property is that type of probability or statistical concept that deals with the measurement of the odds or likelihood of some event.
- It is that form of probability that is simplest in approach and includes the equal likelihood of happening or occurrence of an event.
- In order to determine the numerical probability of an event, it makes use of the knowledge of sample spaces in contrast with the observations.
- It takes a proper note of an event in order to calculate its probability and also it deals with the likelihood of a certain event rather than making observations.
I believe the answer is (-1,1) . The origin is the same as (0, 0) so I drew the line on a quick graph and if you are talking about distance, then the answer should be correct.
Hope this helped :)
Step-by-step explanation:
-8
hope it helps:-) :-) :-) :-)
