Help please, solve prob in the picture
2 answers:
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Answer:
Step-by-step explanation:
From the question we are told that
Number of math tests n=15
standard deviation 1
standard deviation 1
Generally given the two tailed test the null hypothesis is given as
Generally given the two tailed test the null hypothesis is given as
Greetings!
To find the y-intercept, we can arrange the equation in slope y-intercept form:
Rearrange:
The y-intercept is: -13
To find the x-intercept, we can input the value <<0>> in the place of y, as every x-intercept only occurs when y=0:
Solve for x:
The x-intercept is:
I hope this helped!
-Benjamin
To find the y-intercept, we can arrange the equation in slope y-intercept form:
Rearrange:
The y-intercept is: -13
To find the x-intercept, we can input the value <<0>> in the place of y, as every x-intercept only occurs when y=0:
Solve for x:
The x-intercept is:
I hope this helped!
-Benjamin
Answer:
The 95% confidence interval for the average heights of the population is between 1.7108m and 1.7892m.
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.
The standard deviation is the square root of the variance. So
Then
The lower end of the interval is the mean subtracted by M. So it is 1.75 - 0.0392 = 1.7108m
The upper end of the interval is the mean added to M. So it is 1.75 + 0.0392 = 1.7892m
The 95% confidence interval for the average heights of the population is between 1.7108m and 1.7892m.