第三章测试1.Which of the following is not applicable to describe categorical data? （ ）
A:Rate B:Ratio C:Mean D:Proportion
答案:C
2.Which of the following refers to the frequency of a given event during or after a certain time period? （ ）
A:Mean B:Proportion C:Ratio D:Rate 3.Which of the following is TRUE? （ ）
A:The ratio can be used to explain the frequency. B:When the rate is computed based on a sample data, it usually should be adjusted according to the composition of the population C:If the total number of observations is not sufficient, the results should be expressed in relative number. D:The frequency is a time-dependent indicator. 4.There are 120 patients with a certain disease, including 114 males and 6 females, accounting for 95% and 5% respectively. The conclusion is （ ）
A:The disease is easy to get in women B:No conclusion can be drawn C:The susceptibility rates of male and female patients are the same. D:The disease is easy to get in men. 5.The crude mortality of malignant tumors in county A is higher than that in County B. After standardization, the standardized mortality of malignant tumors in county A is lower than that in County B. The most likely reason is （ ）
A:The cancer prevention and treatment work in county A is better than that in County B B:The proportion of the elderly population in the total population in county A is larger than that in County B C:High diagnostic level in county A D:The proportion of the elderly population in the total population in county A is smaller than that in County B
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