Answer:
16.1% is the percentage decrease.
Step-by-step explanation:
We are given the following in the question:
Visitors in February = 1,562
Visitors in march = 1,310
We have to find the percentage decrease of the number of visitors to Alec's website from February to March.
Percentage decrease =

Thus, 16.1% is the percentage decrease in the number of visitors to Alec's website from February to March.
A40=a1 +(40-1)r
in this case r is 3 beceause -2+3 will be 1 etc
a40=-2 +39*3
Answer:
Margin of error of 0.0485 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
.
That is z with a pvalue of
, so Z = 1.96.
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.
In this question:

The margin of error is of:



Margin of error of 0.0485 hours.