The hover dam contains 3 1/2 millon cubic yards of concrete.The grand coulee dam contains 2 1/2 times as much. How much concrete
1 answer:
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Answer:
The expected participation rate is 0.637.
The standard error is 0.04397
Step-by-step explanation:
For each working age people asked, there are only two possible outcomes. Either they are in the labor force, or they are not. This means that we can solve this problem using binomial distribution probability concepts.
Binomial probability:
Expected value for the participation rate: The expected value is the probability of a success. In this problem, a success is a working age people being in the labor force. 63.7% of them are. So . This means that the expected participation rate is 0.637.
Standard error for the participation rate:
The standard error is given by the following formula:
.
In this problem, 120 people are asked, so
.
So the standard error is 0.04397
There was 11.54% decrease in attendance.
Step-by-step explanation:
Attendance in 2014 = Old value = 650
Attendance in 2015 = New value = 575
Change = New value - Old value
Change = 575 - 650 = -75
The negative sign indicates a decrease in attendance.
Decrease percentage =
Rounding off to nearest hundredth
Decrease percent = 11.54%
There was 11.54% decrease in attendance.
Keywords: percentage, subtraction
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