An analyst at an electronics company uses a sample size for estimation calculation before conducting a study to estimate the mean voltage of a new line of resistors used in circuit boards. The analyst wants to know what sample size is required to obtain a margin of error of 5. Based on previous studies, the standard deviation is 22.5.
To achieve a margin of error of 5 when estimating the mean voltage of resistors, the analyst needs to collect a sample size of 81.