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A random sample of 144 bottles of cologne showed an average content of 4 ounces. It is known that the standard deviation of the contents (i.e., of the population) is 0.3 ounces. In this problem the 0.3 is a. the standard error of the mean. O b. a statistic O c. the average content of colognes in the long run. O d. a parameter. When some segments of the population are either more or less likely to respond to the survey mechanism is which of the following nonsampling errors? O a. Measurement error O b. Nonresponse error Oc Coverage error O d. Research error Which of the following probability distributions have the same value for mean, median, and mode? O a Poisson Ob. Normal O c. Uniform O d. Exponential Which of the following symbols represents the mean of the population? O a. Ob. O c. 2 O d. 3 X