Solved by verified expert :102) The sample covariance must take a
value between -1 and +1 inclusive.
103) The sample covariance may never be
negative.
104) The correlation coefficient measures
the strength of a linear relationship between two variables.
105) A correlation coefficient of zero
indicates a lack of relationship between the two variables of interest.
106) The value of the correlation
coefficient may be used to confirm a non-linear relationship.
107) The mean is generally the preferred
measure of central tendency to describe numerical data, but not categorical
data.
108) For any set of numerical data values
arranged in an ascending or descending order, the value of the observation in
the center is called the weighted mean.
109) Categorical data are best described
by the mode.
110) The median should always be preferred
to the mean when the population or sample is skewed to the right or left.
111) One possible source of skewness is
the presence of outliers, and sometimes skewness is simply inherent in the
distribution.
112) Although the range measures the total
spread of the data, the interquartile range (IQR) measures only the spread of
the middle 50% of the data.
113) In a negatively skewed distribution,
the mean is always greater than the median.
114) The coefficient of variation measures
variability in a positively skewed data set relative to the size of the median.
115) When the data values are arranged in
an ascending order, the third quartile (Q3) is located at the position, and first quartile (Q1) is located
at the position.
116) The five-number summary refers to the
five descriptive measures: minimum, mean, median, mode, and maximum; therefore
it is sometimes known as the five-m summary.
