Two formulations Question of 8 pipes, half of a certain coating, designed to inh

Question

Two formulations Question of 8 pipes, half of a certain coating, designed to inhibit sion, are being tested. For each D Assistance the pipe is coated with formulatiord and the other halris coated with formulation B. Each pipe is exposed to a salt environment for 500 hours. Amerward, the corrosion loss (in wm) is measured for each formulation on each pipe. Question Help Report a Problem Pipe A B 1 197 203 2 161 181 3 144 142 4 162 181 5 185 181 6 154 164 7 136 157 8 130 142 Can you conclude that the mean amount of corrosion differs between the two formulations? References

Explanation / Answer

Null hypotehsis:

Ho mean(pipeA)=mean(pipeB)

Alternative Hypothesis:

h1: mean(pipeA) not equal to mean(pipe(B)

two tail t test for diff in means

Output form excel:

t=-0.919

p=0.374

p>0.05

Accept null hypothesis

Conclusion:

there is no sufficient evidence at 5% levl of significance to support the claim that the means are different.

Answer B

No the mean amount of corrsosion does not differ between the two formulations.

t-Test: Two-Sample Assuming Unequal Variances pipeA pipeB Mean 158.625 168.875 Variance 535.9821 459.2679 Observations 8 8 Hypothesized Mean Difference 0 df 14 t Stat -0.91897 P(T<=t) one-tail 0.186836 t Critical one-tail 1.76131 P(T<=t) two-tail 0.373672 t Critical two-tail 2.144787

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