Question

A. 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? H 0​: σ = 130 H 1​: σ < 130B. Is the hypothesis test left-tailed, right-tailed, or two-tailed?C. What parameter is being tested?O Population proportionO Population standard deviationO Population mean

Answer 1

Answer: B. The hypothesis test left-tailed.

C. Population standard deviation

Explanation:

Parameters are the variables that are used to test different espects of the researcher.

The null and alternative hypotheses are given. as

`H_0:\sigma=130\\\\H_1:\sigma<130`

Type of test (left-tailed, right-tailed, or​ two-tailed.) basically depends on the alternative hypothesis.

Here, the alternative hypothesis
`(H_1)` is left-tailed , so the test is a left -tailed test.

We can clearly see that the parameter is being tested here is Population standard deviation (
`\sigma`) .