Diet and health have become big business, but many people are not following good health practices. In 1980, a survey of 150 indicated that 30 percent said that at least one time during that year they had five or more alcoholic drinks in one sitting. In 2000, a similar survey of 150 showed that 38 percent had five drinks in one sitting at least one time during the year. Does this represent a significant increase? Use 0.01 level of significance.
a. The test statistic of -1.46 is not less than -1.96; therefore, the sample evidence indicates that there has been no significant change in the proportion of those who drink heavily at least one day during the year.
b. The test statistic of -1.46 is not less than -2.58; therefore, the sample evidence indicates that there has been no significant change in the proportion of those who drink heavily at least one day during the year.
c. The test statistic of -1.46 is not less than -2.33; therefore, the sample evidence indicates that there has not been significant change in the proportion of those who drink heavily at least one day during the year.
d. The test statistic of -2.56 is less than -2.33; therefore, the sample evidence indicates that there has been significant change in the proportion of those who drink heavily at least one day during the year.
e. The test statistic of -2.56 is less than -2.58; therefore, the sample evidence indicates that there has been significant change in the proportion of those who drink heavily at least one day during the year.
Question 2
The number of degrees of freedom associated with the t test, when the data are gathered from a matched pairs experiment with 13 pairs, is:
a. 13.
b. 26.
c. 12.
d. 24.
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