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Unformatted text preview: tistics, choose the Stats option and enter the summary statistics (sample mean and standard
deviation, and sample size) for each of your samples. 6. The line beginning with m1 allows you to select the form of the alternative hypothesis— use the arrow keys to move the cursor left
and right to select the correct form of your alternative hypothesis. Press [ to select it.
If you are using the pooled procedures, choose Yes; otherwise, select No. You may have to scroll down to see this line.
Select Calculate and press [. The output screen repeats the form of the alternative hypothesis selected. The test statistic, t,
and the pvalue, p, are reported. The degrees of freedom for the test and the summary statistics are also displayed. Inferences for the Difference between Two Proportions 7. Note: If you get an error message, see the warning above for oneproportion procedures.
To make a confidence interval for the difference between two proportions:
1. Press K and scroll to the TESTS menu.
2. Scroll down until you ﬁnd the option 2 –PropZInt and select it.
3. Enter the number of successes (x1) and sample size (n1) for the ﬁrst sample.
(Again number, not proportion, of successes.)
4. Enter the number of successes (x2) and sample size (n2) for the second sample.
5. Determine your conﬁdence level and select Calculate. Press [. The screen displays the conﬁdence
interval inside a set of parentheses and reports the two sample proportions and sample sizes.
To do a hypothesis test on the difference between two proportions:
1. Write down your null and alternative hypotheses.
2. Press K and scroll to the TESTS menu.
3. Scroll down until you ﬁnd the option 2 – PropZTest and select it.
4. Enter the number of successes (x1) and sample size (n1) for the ﬁrst sample.
(Again, the number not proportion of successes.)
5. Enter the number of successes (x2) and sample size (n2) for the second sample.
6. Look at your alternative hypothesis. In the row beginning with the symbol p1, use the arrow keys to move the cursor left or right
to select the correct form of your alternative hypothesis. Press [ to select it.
7. Move the cursor over Calculate and press [. The output screen repeats the form of the alternative hypothesis selected. The
test statistic, z, and the pvalue, p, are given. The two sample proportions are calculated and reported, while the phat without a
subscript is the pooled sample proportion. The sample sizes are also displayed, but you need to scroll down to see these.
As before, you can also select the option Draw in the 2 –PropZTest. 4 The line beginning with m allows you to select the form of the alternative hypothesis—use the arrow keys to move the cursor left or
right to select the correct form of your alternative hypothesis. Press [ to select it.
8. Select Calculate and press [. The screen repeats the form of the alternative hypothesis selected. The test statistic, t, and the
pvalue, p, are reported, along with the sample’s summary statistics.
As before, you can also select the option Draw to see the test results. Inference for Two Sample (Independe...
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This document was uploaded on 01/28/2014.
 Spring '14

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