Math 210 DESCRIPTIVE STATISTICS CLASSIFYING SAMPLES ALEKS (University of phoenix)

A chemist at a pharmaceutical company wants to test the quality of a new batch of microscopes. Which of the following best describes a stratified sample of microscopes? The microscopes in the first shipment that was received are easily accessible. So, he selects all 56 of the microscopes in this shipment. The chemist takes a list of the microscopes and selects every 7th microscope until 56 microscopes are selected. The chemist forms 7 groups of microscopes based on the prices of the microscopes. Then, he selects 8 microscopes at random from each group. A host on a cruise ship wants to collect data on the time passengers spend at various activities on board. Which of the following best describes a convenience sample of passengers?