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4 The homogeneity of the chloride level in a water sample from a lake was tested by analyzing portion drawn from the top and from near bottom of the lake, with the following results in ppm C: Top 26.30 26.43 26.28 26.19 26.49 Bottom 26.22 26.32 26.20 26.11 26.42 CHE2614/101/3/2019 a) Apply the t test at 95% confidence level to determine if the chloride level from the top of the lake is different from that at the bottom. b) Now use the paired t test and determine whether there is a significant difference between the top and bottom values at 95% confidence level.

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4. The homogeneity of the chloride level in a water sample from a lake was tested by analyzing portion drawn from near bottom of the lake, with the following results in ppm CI:日4-4) Given that The + +est for i+ ToP datu Botom cluti 26 -2.2. 26 32 26 .2 26.11 26.42 26 3 26 - 43 26. 28 2 6.49 sind the. formule thes Pooled cean be caleuleated Us The Sum of 8ures are calculated s foou s Sum or Squares (26.30-26 . 332H (26:43-26.339广 t (26-28-26-538J1 C26-10-26.33% (-0.038 4(0.032凢ヒ0.058 t(-0.148)+(ouỳ -t o. 023104 Sum of Square3-(26-22-26.2549% (26.32-26.2 (26 20-26.2x4)+(26.11 -26.2 s4) 26-42-26.254) +0, 004358 + 0.002916-to.o 20 736 ニ0.001156The totul quae0.os 828 4o. oy472 Pooled - N -N, σ.11) Pooled 10-2 S pooled - o.153 degrees of freedom at 05% ćonfidene (cale - 2-6.338-26 23 Culc o-1199 2-5 Sin (e + c4(ム t rit, we can conclude that no Srgni417ant differen ( e exist Soit 35% confíen(e leveD1 26-2.2 26 32 26-2. 26.1 26.42 26 . 3 2L -u3 O. 026.00067 6 26 28 26. O- o8 7 84 CAn 4oO2.236 - 78, c does exist at g5% confiden(e level.

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