Which of the following statements about probability is WRONG（）
A. Probability is the measure of the likelihood that an event will occur
B. The value of a probability lies in the interval of [0,1]
C. The frequency of an event E is exactly the probability of the event E
D. An event with probability of 0 is called an impossible event
E. In reality, probability is difficult to obtain
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To make a statistical inference for the population from a sample, the sample should be（）
A. the most typical part of the population
B. any part of the population
C. the most meaningful part of the population
D. the most explicit part of the population
E. a part randomly selected from the population
The Statistic in Statistics is: （）
A. obtained from the data of the population
B. reflection of the statistical characteristics of the population.r
C. an index calculated based on all data of the population
D. obtained after studying all the individuals in the population
E. a statistical indicator calculated based on the sample
A Statistic is（）
A. equal to a parameter of the population
B. an exact characteristic of the population
C. an index calculated based on all data of the population
D. obtained after studying all the individuals in the population
E. calculated based on a sample
A researcher measured 50 patients’ weights. There were 13 patients less than 50Kg, and 17 patients over 70Kg, with the rest weighing between 50 and 70Kg. Which type of variable is used by the research
A. quantitative variable
B. categorized variable
C. ordinal variable
D. binary variable
E. nominal variable
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