40 pts PLEASE HELP ILL GIVE BRAINLIESTS A. -3 B. -1/3 C. 1/3 D. 3
1 answer:
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Answer:
The minimum sample size that should be taken is 62.
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 .
So it is z with a pvalue of , so
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.
If we want to be 90% confident that the sample mean is within 1 word per minute of the true population mean, what is the minimum sample size that should be taken
This is n when . So
The minimum sample size that should be taken is 62.
Ans: The new price from each donut results in most revenue.
Work in the picture:
Work in the picture:
Answer:
$
Step-by-step explanation:
Let the cost of one brownie,
cost of one cookie
Times on both sides on the second equation above to get the following:
To find the value of , use substitution:
the cost of a brownie is $
Hope this helps :)