A nutritionist wanted to find out if coffee and tea as...

A nutritionist wanted to find out if coffee and tea, as served in restaurants, differed in caffeine content. She went to 30 restaurants. In 15 randomly selected restaurants, she ordered coffee; in the other 15 restaurants, she ordered tea. What statistical test should the nutritionist use to see if coffee and tea differ in mean caffeine content?

The manager of a coffee shop wants to know if his customers' drink preferences have changed in the past year. He knows that last year the preferences followed the following proportions: 34% Americano, 21% Cappuccino, 14% Espresso, 11% Latte, 10% Macchiato, and 10% Other. In a random sample of 450 customers, he finds that 115 ordered Americanos, 88 ordered Cappuccinos, 69 ordered Espressos, 59 ordered Lattes, 44 ordered Macchiatos, and the rest ordered something in the Other category. Run a Goodness of Fit test to determine whether the drink preferences have changed at his coffee shop. Use a 0.05 level of significance. Americanos Capp. Espresso Lattes Macchiatos Other Observed Counts 115 88 69 59 44 75 Expected Counts 153 94.5 63 49.5 45 45 Enter the test statistic - round to 4 decimal places.

Jon S.

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