The design of controls and instruments affects how easily people can use them. Timothy Sturm investigated this effect in a course project, asking 25 right-handed students to turn a knob (with their right hands) that moved an indicator by screw action. There were two identical instruments: one with a right-hand thread (the knob turns clockwise) and the other with a left-hand thread (the knob turns counterclockwise). The table gives the times, in seconds, each subject took to move the indicator a xed distance. Performance times (seconds) using Performance times (seconds) using right-hand and left-hand threads right-hand and left-hand threads Subject Right Thread Left Thread Subject Right Thread Left Thread 1 113 137 14 107 87 2 105 105 15 118 166 3 130 133 16 103 146 4 101 108 17 1 1 1 123 5 138 115 18 104 135 6 1 18 170 19 1 1 1 1 12 7 87 103 20 89 93 8 116 145 21 78 76 9 75 78 22 100 116 10 96 107 23 89 78 11 122 84 24 85 101 12 103 148 25 88 123 13 116 147 Click to download the data in your preferred format. CSV Excel JMP Mac-Text Minitab14-18 Minitab18+ PC-Text R SPSS TI CrunchIt! two decimal places. Give a 95% confidence interval for the mean time advantage of right-hand over left-hand threads. Give your answers to at least lower bound: upper bound