Answer:
The upper limit of a 95% confidence interval for the population mean would equal 83.805.
Step-by-step explanation:
The standard deviation is the square root of the variance. Since the variance is 25, the sample's standard deviation is 5.
We have the sample standard deviation, not the population, so we use the t-distribution to solve this question.
T interval:
The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So
df = 15 - 1 = 14
Now, we have to find a value of T, which is found looking at the t table, with 14 degrees of freedom(y-axis) and a confidence level of 0.95(). So we have T = 1.761
The margin of error is:
M = T*s = 1.761*5 = 8.805.
The upper end of the interval is the sample mean added to M. So it is 75 + 8.805 = 83.805.
The upper limit of a 95% confidence interval for the population mean would equal 83.805.
7/8 is the answer you're looking for
Answer:
No, function is not one-to-one
No, function is not onto
Step-by-step explanation:
We are given that a function
f:
If function is one-to-one then different x have different image .
Domain =Z
Codomain=Z
When function is onto then range=Codomain
Substitute x=1
Then ,
When substitute x=9
Then , we get
Image of 1 and 9 are same hence, function is not one-to-one.
Negative elements of Z and Zero has no preimage.Therefore, function is not onto.
Answer:
the answer is 2.25
Step-by-step explanation:
you divide 6.75÷ 3