1. The following statements were printed in journal articles in the field of psychology. Explain to a person who is unfamiliar with the concept of confidence intervals what each statement means. (3marks)
   1. "The average grade point average of a Greenwald State College student is 2.9 .3 (95% CI)."
   2. "The average number of overtime hours worked in the plumbing industry is 3.7 with a 99% confidence interval of 2.5-4.9."
   3. "Each 1 hour per day of brisk walking is associated with a 24% (95% CI, 19-29%) reduction in obesity."