Question: (a) In the context of descriptive statistics, explain briefly the following concepts: (i) mean, (ii) median, (iii) mode, (iv) variance, (v) standard deviation, (vi) covariance,

(a) In the context of descriptive statistics, explain briefly the following concepts: (i)

mean, (ii) median, (iii) mode, (iv) variance, (v) standard deviation, (vi) covariance,

(vii) correlation coefficient, (viii) regression coefficient.

(b) Explain which of the concepts (i)–(ix) make statistical sense when the data in question are measured on different scales: nominal, ordinal, interval, and ratio.

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