i need help with number 7 please!

accs marocy! suggest that a jociCUAR NG SCHup Use an a 0.05 level of significance. (e) How would the alternative hypothesis change if the differences were computed "before -after"? 12. Mazale Velocity The following data represent the muzzle velocity (in feet per second) of rounds fired from a 155-mm gun. For each round, two measurements of the velocity were recorded using two different measuring devices, with the following data obtained: Observation 2 3 4 5 6 A 793.8 793.1 792.4 794.0 791.4 792.4 B 793.2 793.3 792.6 793.8 791.6 791.6 Observation 7 8 9 10 11 12 A 791.7 792.3 789.6 794.4 790.9 793.5 B 791.6 792.4 788.5 794.7 791.3 793.5 Source: Ronald Christenson and Larry Blackwood. "Tests for Precision and Accuracy of Multiple Measuring Devices Technometrics, 35(4):411-421,1993 (a) Why are these matched-pairs data? (b) Is there a difference in the measurement of the muzzle velocity between device A and device B at the a=0.01 level of significance? Note: A normal probability plot and boxplot of the data indicate that the differences are approximately normally distributed with no outliers. (c) Construct a 99% confidence interval about the population mean difference. Interpret your results. (d) Draw a boxplot of the differenced data. Does this visual. evidence support the results obtained in part (b)? 8. Reaction Time In an experiment conducted online at the University of Mississippi, study participants are asked to react to a stimulus. In one experiment, the participant must press a key on seeing a blue screen and reaction time (in seconds) to press the key is measured. The same person is then asked to press a key on OUT accs marocy! suggest that a jociCUAR NG SCHup Use an a 0.05 level of significance. (e) How would the alternative hypothesis change if the differences were computed "before -after"? 12. Mazale Velocity The following data represent the muzzle velocity (in feet per second) of rounds fired from a 155-mm gun. For each round, two measurements of the velocity were recorded using two different measuring devices, with the following data obtained: Observation 2 3 4 5 6 A 793.8 793.1 792.4 794.0 791.4 792.4 B 793.2 793.3 792.6 793.8 791.6 791.6 Observation 7 8 9 10 11 12 A 791.7 792.3 789.6 794.4 790.9 793.5 B 791.6 792.4 788.5 794.7 791.3 793.5 Source: Ronald Christenson and Larry Blackwood. "Tests for Precision and Accuracy of Multiple Measuring Devices Technometrics, 35(4):411-421,1993 (a) Why are these matched-pairs data? (b) Is there a difference in the measurement of the muzzle velocity between device A and device B at the a=0.01 level of significance? Note: A normal probability plot and boxplot of the data indicate that the differences are approximately normally distributed with no outliers. (c) Construct a 99% confidence interval about the population mean difference. Interpret your results. (d) Draw a boxplot of the differenced data. Does this visual. evidence support the results obtained in part (b)? 8. Reaction Time In an experiment conducted online at the University of Mississippi, study participants are asked to react to a stimulus. In one experiment, the participant must press a key on seeing a blue screen and reaction time (in seconds) to press the key is measured. The same person is then asked to press a key on OUT