Suppose a processing plant will close down a production line for maintenance if the average length of time a robot welder takes to complete the weld is not 1.919 minutes. You want to test whether the production line should be closed for maintenance. a. What is the appropriate null hypothesis? b. What is the appropriate alternative hypothesis?

Null Hypothesis : Average Weld Time = 1.919 ;

Alternate Hypothesis : Average Weld Time ≠  1.919

Explanation:

Null Hypothesis is a neutral 'no effect' hypothesis, signifying no relationship between variables.

Alternate Hypothesis is reverse of Null Hypothesis , signifying effect & relationship between variables.

Given Case : Production Line Closed - If average weld time used by robot ≠ 1.919 ; Production Line not Closed - If average weld time used by robot = 1.919

Null Hypothesis : Average Weld Time = 1.919 ;

Alternate Hypothesis : Average Weld Time ≠  1.919

they protect against unsafe foods and medicines being sold

explanation:

answer; people have no objective standard by which to judge themselves;