Answer:
The minimum sample size is 610.
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 M as such
In which is the standard deviation of the population and n is the size of the sample.
Population standard deviation is $6300, so
Suppose we want to determine the minimum sample size required to give us a 95% confidence interval that estimates, to within $500, the average salary of a state employee.
This is n when M = 500. So
Rouding up
The minimum sample size is 610.
Answer:
$6 each
Step-by-step explanation:
the first 10 multiples of 3 are 3,6,9,12,15,18,21,24,27,30
3×2=6
6+6=12
Answer:
There are 20 items on the list.
Step-by-step explanation:
60% = 0.6
12 / 0.6 = 20
Answer:
$18,112.45 (nearest cent)
Step-by-step explanation:
Let y = value of the boat
Let x = the number of years
If the boat depreciates in value by 15% each year, then each year that goes by, it is worth 85% of the previous year's value (since 100 - 15 = 85)
85% = 85/100 = 0.85
Therefore, the equation is:
So, when x = 10:
Let t be the number of triggerfish and p be the number of parrotfish
t + p = 320
t = 7p
7p + p = 320
8p = 320
p = 40
There are 40 parrotfish.
p = 40
t = 7(40)
t = 280
There are 280 triggerfish.
Check:
t + p = 320
280 + 40 = 320
320 = 320