Randy can run six-tenths of a mile every 4 minutes, but it takes Julie 5 minutes. By the time Julie has run for 20 minutes, how
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Answer:
Possible values of fredicos age satisfy where
denotes fredicos age.
Step-by-step explanation:
Let denotes fredicos age.
Three times the difference of fredicos age and 4, increased by 7 =
According to the question,
So, possible values of fredicos age satisfy
Here, denotes fredicos age.
9514 1404 393
Answer:
254.8
Step-by-step explanation:
Substitute the numbers where the variables are and do the arithmetic.
4c +2b³ = 4(1.2) +2(5³) = 4.8 +250 = 254.8
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It can also work to let a calculator or spreadsheet do the math for you, once you specify the function.
Answer:
a. The point estimate was of $44,600.
b. The sample size was of 16.
Step-by-step explanation:
Confidence interval concepts:
A confidence interval has two bounds, a lower bound and an upper bound.
A confidence interval is symmetric, which means that the point estimate used is the mid point between these two bounds, that is, the mean of the two bounds.
The margin of error is the difference between the two bounds, divided by 2.
a. What is the point estimate of the mean salary for all college graduates in this town?
Mean of the bounds, so:
(38737+50463)/2 = 44600.
The point estimate was of $44,600.
b. Determine the sample size used for the analysis.
First we need to find the margin of error, so:
Relating the margin of error with the sample size:
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 = 1.64.
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.
For this problem, we have that . So
The sample size was of 16.