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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 : Write the null and alternative hypothesis

A similar one-week study with Mountain Communications showed the Internet to be available on 352 of 400 trials. At the .01 significance level, is there a difference in the percent of time that access to the Internet is successful?