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Industrial Statistics with Minitab by Xavier Tort-Martorell Llabres, Lluis Marco Almagro, Pere Grima Cintas

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10.3 Comparison of Two Proportions

Stat > Basic Statistics > 2 Proportions

Example 10.3:
A survey has been carried out among 300 clients of a northern region and it turned out that 33 of them are unsatisfied with the company's service. In the southern region, 250 clients have been consulted and 22 of them expressed discontent. Given this information, can we affirm that the proportion of unsatisfied clients differs between both regions?

In this case, it is not necessary to enter values in the worksheet, since they are entered directly in the dialog box.

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In any of the two cases, since the p-value is greater than 0.05 (usual critical value), it is not possible to conclude that the proportions are significantly different.

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