probability questions

23 Below are the lifetimes, in hours, of fifty 40-watt, 110-volt internally frosted incandescent lamps taken from forced life tests 919 1196 785 1126 936 918 1156 920 948 1067 1092 1162 1170 929 950 905 972 1035 1045 855 1195 1195 1340 1122 938 970 1237 956 1102 1157 978 832 1009 1157 1151 1009 765 958 902 1022 1333 811 1217 1085 896 958 1311 1037 702 923 Construct a box plot for these data. Consider the situation of Exercise 1.28. But now use the following data set. in which shrinkage is measured once again at low, injection velocity and high injection velocity. However, this time the mold temperature is raised to a high level and held constant Shrinkage values at low injection velocity 76 20 76 09 75 98 76 15 76.17 75 94 76.12 76.18 76 25 75.82 Shrinkage values at high injection velocity 93.25 93.19 92 87 93.29 93.37 92 98 93.47 93.75 93.89 91.62 a) As in Exercise 1 28, construct a dot plot with both data sets on the same graph and identify both means (i.e., mean shrinkage for low injection velocity and for high injection velocity). b) As in Exercise 1.28, comment on the influence of injection velocity on shrinkage for high mold temperature. Take into account the position of the two means and the variability around each mean c) Compare your conclusion in (b) with that in (b) of Exercise 1. 28 in which mold temperature was held at a low level. Would you say that there is an interaction between injection velocity and mold temperature? Explain. Reference Exercise 1 28