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【判断题】
极位夹角是反映机构力学性能的参数。A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】A data set that consists of observations on a variable or several variables over time is called a _____ data set.
A.
binary
B.
cross-sectional
C.
time series
D.
experimental
【判断题】A cross-sectional data set consists of observations on a variable or several variables over time.
A.
正确
B.
错误
【简答题】A set of data consists of 38 observations. How many classes would you recommend for the frequency distribution?( ) 注:答案写数字,如9,10
【简答题】A set of data consists of 38 observations. How many classes would you recommend for the frequency distribution?
【简答题】A data set consists of 83 observations. How many classes would you recommend for a frequency distribution?
【单选题】A data set consists of 145 observations that range from 60 to 460, the number of classes should be ( ) for a frequency distribution.
A.
6
B.
7
C.
8
D.
9
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