If a value of serum creatinine is mistakenly recorded, which measures of central tendency will be affected?

• A. Only the mean will increase
• B. Mean, median, and mode will all increase
• C. Mean will increase; median will remain the same
• D. Median and mode will increase; mean remains

Answer: (B)

When a value of serum creatinine is mistakenly recorded, it can lead to an outlier in the data set. The measure of central tendency known as the mean is particularly sensitive to outliers because it is calculated by summing all values and dividing by the total number of values. If the mistakenly recorded creatinine level is significantly higher than the other values, it will skew the mean upwards.

The median, which is the middle value of a data set when arranged in order, could also be affected, depending on the position of the outlier in the sorted list. If the outlier moves the middle point higher, the median will also increase. However, if the outlier is not at the extremes, it could still influence the median.

The mode, or the most frequently occurring value in the data set, can also be influenced if the mistaken value appears more often than the original values, which effectively "modes" the data towards the error.

In summary, if the mistaken value is significantly larger, it will likely increase the mean, median, and possibly the mode, leading to the conclusion that all three measures of central tendency could be affected by the mistaken value, making it reasonable to say they will all increase, depending on the specific circumstances of