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1 answer:
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We shall proceed in graphical method
Graph all 4 functions
- Graph 4
Reason:-
It depends upon coefficient
In graph 4 the coefficient outside root is negative so it is decreasing
Answer: 2.5
Step-by-step explanation:
Let be the population mean .
Then, Null hypothesis :
Alternative hypothesis :
We assume that this is a normal distribution.
Given : Sample size : n=25 , since the sample is small (n<30) so we cannot apply z-test . Thus the test is t-test.
Sample mean :
Population standard deviation :
The test statistic for population mean is given by :-
i.e.
Hence, the observed critical value = 2.5