You wish to test the following claim (HaHa) at a significance level of =0.05=0.0

Question

You wish to test the following claim (HaHa) at a significance level of =0.05=0.05.

      Ho:=72.5Ho:=72.5
      Ha:>72.5Ha:>72.5

You believe the population is normally distributed and you know the standard deviation is =17.8=17.8. You obtain a sample mean of M=78.3M=78.3 for a sample of size n=45n=45.

What is the test statistic for this sample? (Report answer accurate to three decimal places.)
test statistic =

What is the p-value for this sample? (Report answer accurate to four decimal places.)
p-value =

The p-value is...

less than (or equal to)

greater than

This test statistic leads to a decision to...

reject the null

accept the null

fail to reject the null

As such, the final conclusion is that...

There is sufficient evidence to warrant rejection of the claim that the population mean is greater than 72.5.

There is not sufficient evidence to warrant rejection of the claim that the population mean is greater than 72.5.

The sample data support the claim that the population mean is greater than 72.5.

There is not sufficient sample evidence to support the claim that the population mean is greater than 72.5.

Explanation / Answer

The statistical software output for this problem is:

One sample Z summary hypothesis test:
: Mean of population
H0 : = 72.5
HA : > 72.5
Standard deviation = 17.8

Hypothesis test results:

Hence,

Test statistic = 2.186

P - value = 0.0144

The p - value is less than (or equal to) .

Reject the null

The sample data support the claim that the population mean is greater than 72.5.

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