Question

Please use this information to answer the next questions An investigation was launched to address the effectiveness of an antibacterial soup in reducing operating room contamination. The new soup was fosted in a sample of eight operating rooms in the greater Seattle res Data was collected on the level of operating room contamination her values indicate greater contaminar on in these light operating rooms before the new soap was used and after the new soap was used Output are based on alpha-005 Test: Paired Two Sample for Means F-Test Twe-Sample for Variances without now with New without new Variance 6685710968041071 Soap Mean 5.5875 Observations Variance 4.668571429 6.804107143 Pearson Correlation 0265888695 Observations Hypothesired Mean Difference 0.686140199 Stat 3.023923322 Prehone-tal 0.315787349 PTC one-tal 0.009639613 FCritical one-tail 0.254058226 Critical one 1.894578605 Petwotal 0.019279226 tTest: Two-Sample Assuming Equal Variances Critical two-tail 2.354624252 Without new soap With New Soup t-Test: Two-Sample Assuming Unequal Variances 5.5875 Variance 4.668571429 6.804107143 Without new SO With New Soup

Answer 1

Nypothesis chosen ase : Ans: d parts) И, : До млә soap -Мало граро hi Mas new soap - Mnew soap to : > snice will happothesis is always an assimption of equality or no significant relationship. It means it is two sided alternative hypothesis: two sample t-test apstinting equal vasiances of nfs for both € 30/ means n=8 = n2 Also finice footh are soup with tested with kitting bactina they belong to the ② snice n1 =8 = n2 . It forms paired t-test for means. Also sunce n=8<30. leve choose t-test over z-test) cassesponding t-test static is 3.02 ® for salpha = 0.01 we have pvalue = 0.019 C 'Heres pvalues of ar pvalue ka we fail to reject Ho. o can say tho means Mao new soup - new soap / @ It is pretest post test quasi experimental design since it was conducted intentionally by reseaschen and obs were secondled before taftier new soap.