de=3YNJGR99KR 9 Two Population Parameters (e) State the null and alternative hypotheses to determine if hair density increased. (d) The researchers indicated that a test for normality indicated it was reasonable to conclude the change in hair density is approximately normal with no outliers. Does the evidence suggest that PRP injected in the scalp increases hair density? Use an a=0.05 level of significance. (e) How would the alternative hypothesis change if the differences were computed "before- after"? Nw 7. Muzzle 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 1 2 3 4 5 6 A 793.8 793.1 792.4 794.0 7914 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 7896 794.4 7909 793.5 B 7916 792.4 788.5 2947 791.3 793.5 The 102 yin ly the ber ch the econd Sourer Ronald Christenson and Larry Blackwood Toes for Precision and Accuracy of Multiple Measuring Devices Techm (a) Why are these matched-pairs data? (b) Is there a difference in the asurement of the muzzle velocity between device A and device at the o=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 (e) Construct a 8% confidence interval about the population mean difference Interprct your results (d) Draw a boxplot of the differenced data. Do this visual evidence support the results phraised in part (h)? x. Reaction Time In an experiment conducted online at the University of Misisippi tudy participants are asked to react to a stimulus. In one experiment, the parocipien me possa key on