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The null and alternative hypotheses are given. Determine whether the hypothesis test is​ left-tailed, right-tailed, or​...

The null and alternative hypotheses are given. Determine whether the hypothesis test is​ left-tailed, right-tailed, or​ two-tailed. What parameter is being​ tested? H0​: σ=4.2 H1​: σ≠4.2

Choose the correct answer below. Two-tailed,Left-tailed, Right-tailed

What parameter is being​ tested? μ,σ, p

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Answer #1

The given null and alternative hypothesis are given by . By looking into the alternative hypothesis we reject the null hypothesis when the value of the test statistic is less than a constant c or greater than a constant c'. Hence the rejection region is at the two tails of the distribution of the test statistics. Hence the hypothesis test is two-tailed.

Here, from the hypothesis,it is obvious the test is concerned about the parameter .

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