Scanned by CamScanner The thickness of a plastic film in maslona substrate mater

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Scanned by CamScanner The thickness of a plastic film in maslona substrate materialisthought to be nnuenced the temperature at which the is applied In acompletely randomaed experiment 11 substrates coating are coated at 125 F resulting in a sample mean coating thickness of is 1035 and a Sa 15.1 deviation of 102.Another 13substrates are coated sample and standard are observed. The two populations at 15orF for which ia 997 are found to benormallv distributed. 12pt al there sufficient evidence to conclude that the variance of coating thickness diferent for the What is the parameter of interest? What assumptions are made? Write the null and alternative hypotheses Calculate the test statistic. Determine the reject region. Show a graph of the distribution including the reject reeon and Make a decision and write a thorough interpretation in contextof problem. ofthe Scanned by CamScanner

Explanation / Answer

3)

Two-Sample T-Test and CI

Sample N Mean StDev SE Mean
1 11 103.5 10.2 3.1
2 13 99.7 15.1 4.2

Difference = mu (1) - mu (2)
Estimate for difference: 3.80
95% CI for difference: (-7.33, 14.93)
T-Test of difference = 0 (vs not =): T-Value = 0.71 P-Value = 0.486 DF = 22
Both use Pooled StDev = 13.1019

here p-value 0.486>0.05=significance level. so we accept H0 and claim that there is no difference by this two different temp.

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