Mr. X is of the opinion that market has recently shown the Weak Form of Market Efficiency. In order to test the validity of his impression he has collected the following data relating to the movement of the SENSEX for the last 20 days. Days Open High Low Close 1 33470.94 33513.79 33438.03 33453.99 2 33453.64 33478.11 33427.82 33434.83 3 33414.06 33440.29 33397.65 33431.93 4 33434.94 33446.18 33377.78 33383.41 5 33372.92 33380.27 33352.12 33370.93 6 33375.85 33389.49 33331.42 33340.75 7 33340.89 33340.89 33310.95 33330.98 8 33326.84 33340.91 33306.17 33335.08 9 33307.16 33328.22 33296.43 33301.97 10 33298.64 33318.60 33254.28 33259.03 11 33260.04 33228.85 33241.66 33251.53 12 33255.92 33289.46 33249.46 33285.89 13 33288.86 33535.67 33255.98 33329.28 14 33335.00 33346.21 33276.72 33284.17 15 33293.83 33310.86 33278.54 33298.78 16 33300.02 33337.79 33300.02 33325.38 17 33323.36 33356.34 33322.44 33329.95 18 33322.81 33345.98 33317.44 33319.67 19 33317.51 33321.18 33294.19 33302.32 20 33290.86 33324.96 33279.62 33319.61 To test the Weak Form of Market Efficiency using Auto-Correlation test. taking time lag of 10 days