A 2007 study reported in science magazine stated that fifth-grade teachers scored a mean of 3.4 (out of 7) points for "providing evaluative feedback to students on their work." Assume that the sample size was 36 and the sample standard deviation was 1.5.
a. Find t (subscript alpha/2) for a confidence interval with 90% confidence.
b. Compute and interpret the margin of error "E" for a confidence interval with 90% confidence.
c. Construct and interpret a 90% confidence interval for the population mean points scored by fith-grade teachers for providing evaluative feedback.