QUESTION 2: 125] The following data represents the daily demand (y in thousands

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QUESTION 2: 125] The following data represents the daily demand (y in thousands of units) and the unit price (x in dollars) for a product 1 3 5 3 6 8 16 6 Unit price (x) Daily demand (y) 47 39 35 44 34 20 15 30 a) Construct a scatter diagram with unit pice on the horizontal axis and indicate if it appears to be any relationship between the variables and Justify b) Compute and Interpret the sample covariance c) Compute variance and standard dev for the unit price d) Compute variance and standard dev for the daily demand e) Compute and Interpret the sample correlation coefficient 161 13] 13] Page 7 of 10 QUESTION 3 25] Health research was carried out on patients at Medi-Clinic. The pulse rate of 10 randomly chosen alcoholics and 10 non-alcoholics was measured. Alcoholics Non-alcoholics74 80 72 79 77 74 78 77 75 75 62 61 60 65 60 59 58 59 60 62 Determine the mean, the median and the mode of the scores for the pulse rate a) b) Determine the mean, the median and the mode of the scores for the pulse rate [6] c) Comp d) Compute the sample variance and the sample standard deviation for the pulse [5] e) Compute the range and coefficient of variation for the pulse rate of alcoholics [2 of alcoholics. of non-alcoholics rate of alcoholics rate of non-alcoholics ute the sample variance and the sample standard deviation for the p ulse 5) f) Compute the range and coefficient of variation of the pulse rate of non alcoholics

Explanation / Answer

QUESTION 2: 125] The following data represents the daily demand (y in thousands of units) and the unit price (x in dollars) for a product 1 3 5 3 6 8 16 6 Unit price (x) Daily demand (y) 47 39 35 44 34 20 15 30 a) Construct a scatter diagram with unit pice on the horizontal axis and indicate if it appears to be any relationship between the variables and Justify b) Compute and Interpret the sample covariance c) Compute variance and standard dev for the unit price d) Compute variance and standard dev for the daily demand e) Compute and Interpret the sample correlation coefficient 161 13] 13] Page 7 of 10 QUESTION 3 25] Health research was carried out on patients at Medi-Clinic. The pulse rate of 10 randomly chosen alcoholics and 10 non-alcoholics was measured. Alcoholics Non-alcoholics74 80 72 79 77 74 78 77 75 75 62 61 60 65 60 59 58 59 60 62 Determine the mean, the median and the mode of the scores for the pulse rate a) b) Determine the mean, the median and the mode of the scores for the pulse rate [6] c) Comp d) Compute the sample variance and the sample standard deviation for the pulse [5] e) Compute the range and coefficient of variation for the pulse rate of alcoholics [2 of alcoholics. of non-alcoholics rate of alcoholics rate of non-alcoholics ute the sample variance and the sample standard deviation for the p ulse 5) f) Compute the range and coefficient of variation of the pulse rate of non alcoholics

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