A mail-order retailer spends considerable effort in “picking” orders—selecting the order...

A mail-order retailer spends considerable effort in “picking” orders—selecting the ordered items and assembling them for shipment. A small study took a sample of 100 orders. An experienced picker carried out the entire process. The time in minutes needed was recorded for each order. A scatterplot and spline fit, created using JMP, are shown. What sort of transformation is suggested by the plot?