Kelompok Tanpa zat tambahan Dengan zat tambahan z-Test: Two Sample for Means1 10 92 9 113 9 10 Mean4 9 11 Known Variance5 8 9 Observations6 9 11 Hypothesized Mean Dif7 10 9 z8 9 8 P(Z<=z) one-tail9 10 11 z Critical one-tail

10 9 8 P(Z<=z) two-tail11 8 11 z Critical two-tail12 8 1013 8 914 9 915 10 816 10 1017 8 1018 8 919 9 820 9 821 9 822 7 1023 8 1024 8 825 9 826 7 1027 8 928 8 1129 9 930 10 10

z-Test: Two Sample for Means

Tanpa zat tambahan Dengan zat tambahan8.73333333333333 9.4

1.5 1.2330 30

0-2.20997848043932

0.01355332791313861.64485362695147

0.02710665582627711.95996398454005