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A.binomial
B.uniform
C.normal
D.Possion
A.68%
B.95%
C.99.7%
D.none of the above
A.the variance is not as accurate a measurement as the standard deviation
B.the standard deviation has been corrected for bias while the variance has not
C.the standard deviation is in the same units as the data values.
D.the variance is in the same units as the data values.
A.square
B.absolute value
C.minimum
D.maximum
A.median;mean
B.data point;mean
C.quartile;median
D.data point;median
A.approximation theorem
B.normal probability theorem
C.central limit theorem
D.central normality theorem
A.sample based upon information contained in the population
B.population based upon information contained in the sample
C.population based upon information contained in the population
D.mean of the sample based upon the mean of the population
A.P(A) must be equal to P(B)
B.P(A) must be greater thanP(B)
C.P(A) must be less than P(B)
D.P(A) must be equal to P(A│B)
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Simon Arnett, Director of Human Resources, is exploring the causes of employee absenteeism at Buderim Bottling during the last operating year (1 January 2005 to 31 December 2005). Personnel records of 50 employees are selected for analysis. (The plant employs 250.) For this study, the average number days absent for these 50 employees is a ().
If the individual class frequency is divided by the total frequency, the result is the ().
某班的学习按考试成绩分为60分以下,60-70,70-80,80-90,90-100,这种分组()
企业生产一种产品需顺次经过四个车间,这四个车间的废品率分别为1.5%、2.0%、2.0%和1.0%。该企业生产这种产品的平均废品率是多少?
One advantage of a stem and leaf plot over a frequency distribution is that ().
对某班级学生的生活状况进行统计调查,下列标志中属于不变标志的是()
对全国各铁路交通枢纽的货运量、货物种类等进行调查,以了解全国铁路货运概况。这种调查属于()
One rule that must always be followed in constructing frequency distributions is that ().
以2000年a0为最初水平,2016年an为最末水平,计算钢产量的年平均发展速度时,须开()
The number of class intervals in a frequency distribution is usually between ().