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Test comparing two means with variances

In a left-ailed test comparing two means with variances unknown but assumed to be equal, the sample sizes were n1 = 8 and n2 = 12. At Î± = .05, the critical value would be:

-1.960

-2.101

-1.734

-1.645

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## Q : Statistical evidence support manufacturer claim

Also conduct a test of hypothesis at the 5% significance level. Does the statistical evidence support the manufacturer's claim? And what is the p value?