Mathematics, 06.04.2021 05:30 jonystroyer1020
Wells Fargo has realized that they lose home mortgage business to other banks that can process the loan applications with less variability in the time it takes to process each application. The bank recently studied this problem, and found that the processing time T is normally distributed with a mean of 14 days. They did not measure the standard deviation, but they know that 50% of all applications were processed in between 11.3 and 16.7 days. After learning all this, they then fired half of their mortgage loan officers and replaced them with new recruits. They then sampled 13 applications, and found a sample mean of 14 days (same as the old) and a sample standard deviation of 3.4 days. Test whether their actions have significantly DECREASED the variability of their processing time T. State both the p-value associated with the test and what criterion you are using to decide whether or not their actions had a significant effect with 90% confidence. (a) (b) (c) (d) (e) (f) number (rtol
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