Microsoft Office Tutorials and References

In Depth Information

Therefore, to use the t-table in Appendix E, you need to take the absolute value

of the t-value you found when you use the t-test formula since the t-table in

Appendix E only has the values of t that are the positive values for t.

Throughout this topic, we are assuming that you want to be 95 % conﬁdent in

the results of your statistical tests. Therefore, the value for t in the t-table in

Appendix E tells you whether or not the t-value you obtained when you used the

formula for the one-group t-test is within the 95 % interval of the t-curve range

that that t-value would be expected to occur with 95 % conﬁdence.

If the t-value you obtained when you used the formula for the one-group t-test is

inside of the 95 % conﬁdence range, we say that the result you found is not

signiﬁcant (note that this is equivalent to accepting the null hypothesis!).

If the t-value you found when you used the formula for the one-group t-test is

outside of this 95 % conﬁdence range, we say that you have found a signiﬁcant

result that would be expected to occur less than 5 % of the time (note that this is

equivalent to rejecting the null hypothesis and accepting the research hypothesis).

4.1.6 STEP 6: State the Result of Your Statistical Test

There are two possible results when you use the one-group t-test, and only one of

them can be accepted as ‘‘true.’’

Either:

Since the absolute value of t that you found in the t-test formula is less

than the critical value of t in Appendix E, you accept the null hypothesis.

Or:

Since the absolute value of t that you found in the t-test formula is

greater than the critical value of t in Appendix E, you reject the null

hypothesis, and accept the research hypothesis.

4.1.7 STEP 7: State the Conclusion of Your Statistical Test

in Plain English

In practice, this is more difﬁcult than it sounds because you are trying to summarize

the result of your statistical test in simple English that is both concise and accurate

so that someone who has never had a statistics course (such as your boss, perhaps)

can understand the result of your test. This is a difﬁcult task, and we will give you

lots of practice doing this last and most important step throughout this topic.

If you have read this far, you are ready to sit down at your computer and

perform the one-group t-test using Excel on some hypothetical data.

Let’s give this a try.

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