You wish to test the following claim (H1H1) at a significance
level of α=0.10α=0.10.
You believe the population is normally distributed, but you do not know the standard deviation. You obtain a sample of size n=331n=331 with a mean of M=80.6M=80.6 and a standard deviation of SD=8.2SD=8.2.
What is the critical value for this test? (Report answer accurate to three decimal places.)
critical value = ±±
What is the test statistic for this sample? (Report answer accurate to three decimal places.)
test statistic =
The test statistic is...
This test statistic leads to a decision to...
As such, the final conclusion is that...
n=331 with a mean of M=80.6 and a standard deviation of SD=8.2
T critical = T.INV.2T(alpha, n-1)
setting alpha = 0.10 and n-1 = 331 -1 = 330
t critical = T.INV.2T(0.10,330) =
Using TI 84 calculator
press stat then tests then Ttest
enter the data
test statistic = 1.553
test statistic is
test statistic leads to a decision to...
There is sufficient evidence to warrant rejection of the claim that the population mean is not equal to 79.9.
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