The quality department at ElectroTech is examining which of two microscope brands $($Brand A or Brand B$)$ to purchase. Using each microscope, an inspector examines six circuit boards and records the number of defects $($e$.$g$.,$ solder voids, misaligned components, etc.$).$ The accompanying table shows a portion of the results. $($You may find it useful to reference the appropriate table: z table or t table$)$