d. The time that the customer leaves the 2. Mary and Tom operate a lemonade stand. They are concerned that the lemonade does not taste fresh at the end of the day. Which of the following variables is an environmen- tal variable in their operation? a. The temperature of the lemonade when they take it out of their refrigerator in the morning b. The temperature of the air during the day c. The temperature of the lemonade d. The temperature of the water used to make the lemonade 3. Following the announcement of a major quality problem, the share price of a com- pany falls substantially. This decrease is a result of assignable cause variation. True or false? a. True b. False 4. You harvest 50 tomatoes. You notice that the tomatoes vary in size and weight. If some of the tomatoes were exposed to extra sunshine or irrigation, this would be a common cause variation. True or false? a. True b. False