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

B. The hypothesis test left-tailed.

C.  Population standard deviation

Step-by-step explanation:

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

The null and alternative hypotheses are given. as

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

Here, the alternative hypothesis 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 () .

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step-by-step explanation:

both equations and proportions are better.