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Writing Assignment 5-Case Study: The “Bank Robberies: A Statistical Analysis
(p. 366): Answer questions a, b, c, d, e, and f. Jessica Collier

A) 1) Amount Stolen- 20,330.5 is a point estimate for the population mean. 20,330.5 pounds sterling during the 364 bank raids over several years in the UK, with the point estimate for the sample standard deviation of 53,510.2.
2) Number of Bank Staff Present - 5.417 is a point estimate for the population mean. 5.417 bank staff present during the 364 bank raids over several years in the UK, with the point estimate for the sample standard deviation of 4.336.
3) Number of Customers Present- 2.000 is a point estimate for the population mean. 2.000 customers present during the 364 bank raids over several years in the UK, with the point estimate for the sample standard deviation of 3.684.
4) Number of Bank Raiders- 1.637 is a point estimate for the population mean. 1.637 bank raiders involved during the 364 bank raids over several years in the UK, with the point estimate for the sample standard deviation of .971.
5) Travel Time, in minutes to Police Station- 4.557 is a point estimate for the population mean. 4.557 travel time to the nearest police station from the bank during the 364 bank raids over several years in the UK, with the point estimate for the sample standard deviation of 4.028. B) 95% Confidence Interval of Amount Stolen:
Sample Size (n): 364 raids Sample Mean (x): 20,330.5 Std. Dev. (σ): 53,510.2 α=1-.95= 0.05→zα/2 is 1.96 x - zα/2( σn) to x + zα/2( σn)
20,330.5 - (-1.96)53,510.2364 = 14,833.295
20,330.5 + (-1.96)53,510.2364 = 25,827.705
Thus the 95% confidence interval is from 14,833.295 to 25,827.705.
I am 95% confident that the mean amount stolen, μ, from all 364 raids in the UK over several years is between 14,833.295 and 25,827.705 pounds sterling.

C) 95% Confidence Interval of

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