Answer:
Step-by-step explanation:
Given that the population of a city increased steadily over a ten-year span. The following ordered pairs show the population x and the year y over the ten-year span in the form (x, y) for specific recorded years.
x y
2500 2001
2650 2002
3000 2004
3500 2007
4200 2011
Slope 0.005865485
Intercept 1986.406413
So regression line is
When population = 15000
Answer:
The formula to generate 70% confidence interval is: , in which
is the sample mean.
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 Z-table as such z has a p-value of .
That is z with a pvalue of , so Z = 1.037.
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.
Assume that body masses of Goldfinch birds follow a normal distribution with standard deviation equal to 0.04 oz.
This means that .
Sample of 10 birds:
This means that .
The margin of error is of:
The lower end of the interval is the sample mean of subtracted by M.
The upper end of the interval is the sample mean of added to M.
Then, the formula to generate 70% confidence interval is: , in which
is the sample mean.