The final grades of forty students were randomly selected, recorded and inputted into minitab the results are summarized in exhibit 1 below one-Sample Z: Grade Test of mu = 85 vs =/ 85 the sum standard deviation =5.25 variable N Mean StDev Se Mean grade 40 87 5.25 * Calculate the value of *? State the null and alternative hypotheses for the test What is the value of test statistic for this test Calculate the p-value for the test State the conclusion the test. Give a reason for your answer
The final grades of forty students were randomly selected, recorded and inputted into minitab the results are summarized in exhibit 1 below
one-Sample Z: Grade
Test of mu = 85 vs =/ 85
the sum standard deviation =5.25
variable N
grade 40 87 5.25 *
- Calculate the value of *?
- State the null and alternative hypotheses for the test
- What is the value of test statistic for this test
- Calculate the p-value for the test
- State the conclusion the test. Give a reason for your answer
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Given information
Sample mean x̅ = 87
Population mean µ = 85
Sample size n = 40
Standard deviation σ = 5.25
Since population standard deviation is known therefore using z-test statistics.
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