In 2003, the American Psychological Association conducted a survey of a

random sample of psychologists to estimate mean incomes for psychologists with

various academic degrees and levels of experience. Of the 31 psychologists who

received a master's degree in 2003, the mean income was $43,834 and the standard

deviation was $16,870.

a) What is the point estimate?

b) What is the appropriate t-score?

c) Calculate the standard error.

d) Construct a 95% confidence interval for the population mean. Interpret.