Question

Question 16 View Policies Current Attempt in Progress Are Errors Less Likely with Electronic Prescriptions? Errors in medical prescriptions occur and a study examined whether electronic prescribing may help reduce errors. Two groups of doctors used written prescriptions and had similar error rates before the study. One group switched to e-prescriptions while the other continued to use written prescriptions, and error rates were measured one year later. The results are given in Table 1. Error No Error Total Electronic Written 254 1478 3594 2370 3848 3848 Table 1 Are prescription error rates different? Find a 95% confidence interval for the difference in the two proportions, Pw - Pe , where Pw is the proportion of errors using written prescriptions and Pe is the proportion of errors using e-prescriptions. Round your answers to three decimal places. The 95% confidence interval is i to i Is it plausible that there is no difference? 1Kaushal, R., et. al., "Electronic Prescribing Improves Medication Safety in Community-Based Office Practices," Journal of General Internal Medicine, June 2010; 25(6): 530-536.

Answer 1

Calculate the sample proporton filom aliven dat, Pue - Xwe nul 1478 3848 Pue = 0.384 and PE - RE NE 254 3848 P = 0.066 951. Confidence Interval for critical value zale = 1996 95). cs for the depperence in too proportion (Pw-Pe) :- cs = (w-Pe): Zelk fu l-fw ) Bill-pe) nu ПЕ » (0.384-0.066 ) 1.96 10.236544 - 0.061644 3848 3848 = 0.318 + 0.01725 = (0:318 -0.01725, 0.318 + 0.01725 ) CI - (0.301, 0.335 ) ... The Required confidence Interae is 0.301 _(Pw-Pe) 20.335 No, it is not plausible that there is no difference