Question

1.A poll of 64 people reveals that 63.7% prefer Pepsi to Coca-Cola. You want to test the hypothesis that among the population Coca-Cola is preferred to Pepsi.

Report the **z-statistic** for this test.

*Note: Respondents only have the choice of the two, so
Coca-Cola is preferred to Pepsi if the proportion who prefer Pepsi
is less than 50%.*

2.A poll of 67 Arizonans finds that 49.7% of them say they like Thai food. A similar poll of 62 Californians finds that 31.9% of them say they like Thai food. You want to test whether this difference in these proportions is statistically significant.

Report the **z-statistic** for this test.

*Note: when taking the difference, you should do Arizona -
California.*

Answer #1

1)

2)

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