Long Manufacturing produces heat exchangers, primarily for the automotive industry. One such product, a transmission oil cooler, is used in the cooling of bus transmissions. It is composed of a series of copper tubes that are soldered into a header. The header must have a diameter of 4.984 inches with specification limits LSL = 4.978 inches and USL = 4.990 inches. Oversized headers result in fluid mixing and possible failure of the device. For every 100 headers produced, the operations manager draws a sample of size 4. The data from the last 25 samples were recorded. What can we conclude from these data?