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D28:

(D4–D5)/D22 (use 2 decimals)

This formula should give you a value for the t-test of: 24.55.

Nest, check to see if you have rounded off all ﬁgures in D13: D28 to two

decimal places (see Fig.
5.11
).

Fig. 5.11

Results of the t-test formula for item #12 for introductory biology 101

Now, write the following sentence in D31–D34 to summarize the result of the

study:

D31:

Since the absolute value of -4.55

D32:

is greater than the critical t of

D33:

1.96, we reject the null hypothesis

D34:

and accept the research hypothesis.

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