In the article “Bactericidal Properties of Flat Surfaces and Nanoparticles Derivatized with Alkylated Polyethylenimines” (J. Lin, S. Qiu, et al., Biotechnology Progress, 2002:1082– 1086), experiments were described in which alkylated polyethylenimines were attached to surfaces and to nanoparticles to make them bactericidal. In one series of experiments, the bactericidal efficiency against the bacterium E. coli was compared for a methylated versus a non-methylated polymer. The mean percentage of bacterial cells killed with the methylated polymer was 95 with a standard deviation of 1, and the mean percentage of bacterial cells killed with the nonmethylated polymer was 70 with a standard deviation of 6. Assume that five independent measurements were made on each type of polymer. Find a 95% confidence interval for the increase in bactericidal efficiency of the methylated polymer.
In the article “Bactericidal Properties of Flat Surfaces and Nanoparticles Derivatized with
Alkylated Polyethylenimines” (J. Lin, S. Qiu, et al., Biotechnology Progress, 2002:1082–
1086), experiments were described in which alkylated polyethylenimines were attached to
surfaces and to nanoparticles to make them bactericidal. In one series of experiments, the
bactericidal efficiency against the bacterium E. coli was compared for a methylated versus a
non-methylated polymer. The mean percentage of bacterial cells killed with the methylated
polymer was 95 with a standard deviation of 1, and the mean percentage of bacterial cells
killed with the nonmethylated polymer was 70 with a standard deviation of 6. Assume that
five independent measurements were made on each type of polymer. Find a 95% confidence
interval for the increase in bactericidal efficiency of the methylated polymer.
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