A coffee shop owner is interested in determining what people think about the new coffee flavor. Which of the following is the population in this situation?
a all customers who bought the new coffee
b all customers who did not buy the new coffee
c the first 50 customers who bought the new coffee
d 100 random customers
a all customers who bought the new coffee
Tom wants to know the average number of musical instruments students in his school play. He used the school’s two band classes, consisting of a total of 48 students, as his representative sample. He concluded that students in his school play an average of three musical instruments. Is his conclusion valid?
a Yes, because all members of the sample play at least one musical instrument.
b Yes, because the sample includes both males and females who play musical instruments.
c No, because he did not choose students randomly.
d No, because his representative sample is too large.
c No, because he did not choose students randomly.
A survey is conducted to determine the most common reason people own a cell phone. A company sent out a survey to customers between the ages of 20 and 30. Based on the responses, the company concluded that people own a cell phone for messaging purposes. Is this conclusion valid?
a Yes, because the sample includes all customers between the ages of 20 and 30.
b No, because the sample includes customers of too many different ages.
c Yes, because the sample includes male and female customers.
d No, because not all people who own a cell phone have the same probability of being selected.