DrKline,an Environmental Psychologist,conducts a Study to Examine Whether Visiting Zoos

Multiple Choice

Dr.Kline,an environmental psychologist,conducts a study to examine whether visiting zoos causes people to have more positive attitudes toward environmental conservation.He asks a group of 45 people attending the zoo on a Saturday morning about their attitudes.He finds that 69% of the people report having a positive attitude after their visit.Which of the following is true for Dr.Kline's study?

A) He is lacking a control group.
B) He did not manipulate an independent variable.
C) He cannot make a causal statement.
D) He is unable to determine covariance.
E) All of the above are true of his study.