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2 answers:
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Answer:
Step-by-step explanation:
Given that
Population mean
std deviation = 12
sample size n =36
Sample mean =
(Two tailed test)
Mean difference = 7
Std error =
Since population std dev is known and n>30 we use Z test
Z statistic =
p value <0.001
Since p value is <0.01, at 1% significance level, we reject H0.
There is significant difference between sample mean and population mean.
Answer:
The correct options are a,b.
Step-by-step explanation:
The area of sector of a circle equals
Area of a sector =
where
is the angle subtended at the center by the sector
is the radius of circle
This indicates that area of the sector depends on:
1) Radius of circle
2) Angle subtended at the center by the sector
3) Area of sector does not depend on pi.
Also if we know the area of the sector only we cannot calculate area of area of whole triangle as we need one more information either angle of the sector and vice versa.