1) Which level of measurement is required for the median?
 A.   Ordinal 
 B.   Ratio 
 C.   Nominal 
 D.   Interval 
2) The weighted mean is a special case of the:
 A.   Median 
 B.   Geometric mean 
 C.   Mean 
 D.   Mode 
3) A difference between calculating the sample mean and the population mean is:
 A.   We divide the sum of the observations by n  1 instead of n 
 B.   There are no differences. 
 C.   Only in the symbols, we use instead of µ and n instead of N. 
 D.   The observations are ranked and select the middle value for the population mean. 
4) The mean and the variance are equal in
 A.   The binomial distribution. 
 B.   The hypergeometric distribution. 
 C.   All probability distributions. 
 D.   The Poisson distribution. 
5) The difference between a random variable and a probability distribution is:
 A.   A random variable does not include the probability of an event. 
 B.   A random variable can only assume whole numbers. 
 C.   A probability distribution can only assume whole numbers. 
 D.   None of the above. 
6) In which of the following distributions is the probability of a success usually small?
 A.   Poisson 
 B.   All distribution 
 C.   Binomial 
 D.   Hypergeometric 
7) A sample 
 A.   Is part of the population. 
 B.   Has more than 30 observations. 
 C.   Is usually identified as N. 
 D.   All of these 


8) Suppose a population consisted of 20 items. How many different samples of n = 3 are possible? 
 A.   1140 
 B.   120 
 C.   6840 
 D.   20 


9) The difference between the sample mean and the population mean is called the 
 A.   Population standard deviation. 
 B.   Sampling error. 
 C.   Population mean. 
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