In order to estimate the percentage of defects in a recent manufacturing batch, a quality control manager at Intel selects every 8th chip that comes off the assembly line starting with the 3rd, until she obtains a sample of 140 chips.

systematic sampling method

Explanation:

Based on the information provided within the question it can be said that in this scenario the method that was used was a systematic sampling method. This method focuses on selecting elements from a ordered sampling frame, which in this case refers to every 8th chip starting from the 3rd. This method repeats once the end of the list or process is reached which is 140 chips in this scenario.

answer6-9 screws;

only #2 represents an object at rest on a table.

in #1, there is no normal force due to the table; the object is accelerating downward.

in #3, the vertical forces are not balanced; the object is accelerating downward.

in #4, neither the vertical nor the horizontal forces are balanced. the object is accelerating upwards and to the right.