A recent publication by Concur provided a summary of travel expenses for both small and medium-sized businesses (SMBs) and large-scale companies.8 A random sample of business trips to some of the most...

A recent publication by Concur provided a summary of travel expenses for both small and medium-sized businesses (SMBs) and large-scale companies.8 A random sample of business trips to some of the most visited international cities was obtained, and the amount spent on ground transportation was recorded (in dollars). Is there any evidence to suggest that at least two of the population mean amounts spent on ground transportation are different?

Many people who live in northern states supplement their main heating system with kerosene heaters. These devices are generally inexpensive, but a kerosene flame emits a noticeable ash and the fumes must be well ventilated. The flash point of kerosene is related to purity, ash, fumes, and safety. A low flash point is a fire hazard and may be an indication of contamination. Independent random samples of kerosene from five dealers in Maine were obtained and the flash point of each was measured (in °C). Is there any evidence to suggest that at least two of the population mean flash points are different?