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The recent national elections apparently drew more interest and debate among voters than prior elections. A national sample of 1719 adults, aged 18 and older, surveyed over the telephone (using both landlines and cell phones) revealed that 72% reported that they had given "quite a lot" of thought to the upcoming election. Is there any evidence that the percentage has changed from the reported benchmark of 61% during the same timeframe before the previous election?
a) Find the z-score of the observed proportion.
b) Compare the z-score to the critical value for alpha
equals 0.01
significance level using two-sided alternative.
c) Explain your conclusion.
