TWO GROUPS OR ONE? Situations comparing two proportions are described. In each case, determine whether the situation involves comparing proportions for two groups or comparing two proportions from the same group. State whether the methods of this section apply to the difference in proportions. (a) In a taste test, compare the proportion of tasters who prefer one brand of cola to the proportion who prefer the other brand. This situation involves comparing: 1 group or 2 groups? Do the methods of this section apply to the difference in proportions? Yes or No (b) Compare the males who voted in the last election to the proportion of females who voted in the last election. This situation involves comparing: 1 group or 2 groups? Do the methods of this section apply to the difference in proportions? Yes or No (c) Compare the graduation rate (proportion to graduate) of students on an athletic scholarship to the graduation rate of students who are not on an athletic scholarship. This situation involves comparing: 1 group or 2 groups? Do the methods of this section apply to the difference in proportions? Yes or No (d) Compare the proportion of voters who vote in favor of a school budget to the proportion who vote against the budget. This situation involves comparing: 1 group or 2 groups? Do the methods of this section apply to the difference in proportions? Yes or No
TWO GROUPS OR ONE?
Situations comparing two proportions are described. In each case, determine whether the situation involves comparing proportions for two groups or comparing two proportions from the same group. State whether the methods of this section apply to the difference in proportions.
(a) In a taste test, compare the proportion of tasters who prefer one brand of cola to the proportion who prefer the other brand.
This situation involves comparing: 1 group or 2 groups?
Do the methods of this section apply to the difference in proportions? Yes or No
(b) Compare the males who voted in the last election to the proportion of females who voted in the last election.
This situation involves comparing: 1 group or 2 groups?
Do the methods of this section apply to the difference in proportions? Yes or No
(c) Compare the graduation rate (proportion to graduate) of students on an athletic scholarship to the graduation rate of students who are not on an athletic scholarship.
This situation involves comparing: 1 group or 2 groups?
Do the methods of this section apply to the difference in proportions? Yes or No
(d) Compare the proportion of voters who vote in favor of a school budget to the proportion who vote against the budget.
This situation involves comparing: 1 group or 2 groups?
Do the methods of this section apply to the difference in proportions? Yes or No
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