Mathematics, 05.08.2020 04:01 Marleneg
The deterioration of many municipal pipeline networks across the country is a growing concern. One technology proposed for pipeline rehabilitation uses a flexible liner threaded through existing pipe. An article reported the following data on tensile strength (psi) of liner specimens both when a certain fusion process was used and when this process was not used.
No fusion 2738 2710 2645 2822 2501
3149 3267 3213 3230 2763
m = 10
x = 2903.8
s1 = 281.8
Fused 3027 3346 3369 3297 3135 2900 2889 2912
n = 8
y = 3109.4
s2 = 206.1
Does the data suggest that the standard deviation of the strength distribution for fused specimens is smaller than that for not-fused specimens? Carry out a test at significance level 0.01.
Calculate the test statistic. (Round your answer to two decimal places.)
f =
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