An educator claims that the average salary of substitute teachers in school districts in NC earn less than $82 per day. A random sample of twelve districts is selected, and the daily salaries are given below. With α = 0.10, is there enough evidence to support the claim? Please show all steps.
89 75 90 77 60 100 75 85 80 100 75 85
Identify the Null Hypothesis:
Identify the Alternate Hypothesis:
Work: Please show formula
Let
denotes the average salary of substitute teachers in school
districts in NC earn.
To test
against
Here
sample mean
sample standard deviation
and sample size
The test statistic can be written as
which under H0 follows a t distribution with n-1 df.
We reject H0 at 10% level of significance if
Now,
The value of the test statistic
and critical value
Since
, so we fail to reject H0 at 10% level of significance
and we can conclude that the average salary of substitute teachers
in school districts in NC earn is not significantly less than $82
per day.
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