G solve the equation, and check the solution. R plus 7 equals 9r+7=9 the solution set is startset nothing endset . (type an in
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Answer:
positive
Step-by-step explanation:
To solve this, we can look at the unit circle (see attached photo), We know:
(0,1) = π/2
(-1, 0) = π
(0, -1) = 3π/2
(1, 0) = 0
Across the circle, we know that π/3 is between 0 and π/2. Therefore, as the unit circle line between that is positive in the x direction (cos), we can say that cos(π/3) is positive
If the standard deviation is 9 and sample size is 100 then the standard error is 0.9.
Given that the mean is 80,standard deviation be 9 and sample size be 100.
We are required to find the standard error of the given data.
The standard error of a statistic is basically the standard deviation of its sampling distribution or an estimate of that standard deviation.
Standard error=σ/
in which σ is standard deviation and n is sample size.
Here standard deviation is 9 and sample size is 100.
Standard deviation=9/
=9/10
=0.9
Hence if the standard deviation is 9 and sample size is 100 then the standard error is 0.9.
Learn more about standard error at brainly.com/question/1191244
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