Answer with explanation:
For any object having the velocity vector as
the magnitude of velocity is given by
For car 1 the velocity vector is
Therefore
Similarly for car 2 we have
Therefore
Comparing both the values we find that car 1 has the greater speed.
Answer:
All real numbers
Step-by-step explanation:
See the image.
Answer:
So on this case the 95% confidence interval would be given by (38.608;39.392)
Step-by-step explanation:
Previous concepts
A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".
The margin of error is the range of values below and above the sample statistic in a confidence interval.
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
represent the sample mean for the sample
population mean (variable of interest)
represent the population standard deviation
n=25 represent the sample size
Solution to the problem
The confidence interval for the mean is given by the following formula:
(1)
The margin of error is given by:
Since the Confidence is 0.95 or 95%, the value of and
, and we can use excel, a calculator or a tabel to find the critical value. The excel command would be: "=-NORM.INV(0.025,0,1)".And we see that
And replacing we got:
Now we have everything in order to replace into formula (1):
So on this case the 95% confidence interval would be given by (38.608;39.392)
Answer:
3).
4).
If it was by 10, k = 3 by 10
k = 30
5).