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Answer:
We need to conduct a hypothesis in order to check if the mean is higher than 75, the system of hypothesis are :
Null hypothesis:
Alternative hypothesis:
A. One-Tailed
If we compare the p value and the significance level given we see that
so we can conclude that we have enough evidence to FAIL to reject the null hypothesis.
Step-by-step explanation:
Data given and notation
We have the following data: 84 94 80 88 77 68 90 74 96 71
We can calculate the sample mean with the following formula:
And replacing we got:
represent the sample mean
represent the population standard deviation
sample size
represent the value that we want to test
represent the significance level for the hypothesis test.
z would represent the statistic (variable of interest)
represent the p value for the test (variable of interest)
State the null and alternative hypotheses.
We need to conduct a hypothesis in order to check if the mean is higher than 75, the system of hypothesis are :
Null hypothesis:
Alternative hypothesis:
A. One-Tailed
Since we know the population deviation, is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:
(1)
z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".
Calculate the statistic
We can replace in formula (1) the info given like this:
P-value
Since is a ONE-TAILED test the p value would given by:
Conclusion
If we compare the p value and the significance level given we see that
so we can conclude that we have enough evidence to FAIL to reject the null hypothesis.