Answer: 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
[tex]H_0:\sigma=130\\\\H_1:\sigma<130[/tex]
Type of test (left-tailed, right-tailed, or two-tailed.) basically depends on the alternative hypothesis.
Here, the alternative hypothesis [tex](H_1)[/tex] 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 ([tex]\sigma[/tex]) .
