DO NOT ANSWER UNLESS YOU KNOW IT. Use the given degree of confidence and sample data to construct a confidence interval for the population mean µ. Assume that the population has a normal distribution. Show your work. n = 30, x = 89.3, s = 18.9, 90 percent

A) (79.79, 98.81)
B) (82.24, 96.36)
C) (83.47, 95.13)
D) (83.44, 95.16)

Kilgore trout creates a new scale to diagnose depression. however, his scale only assesses one symptom of depression while ignoring others. which of the following is his new scale most likely lacking? a) test-retest reliability b) discriminant validity c) criterion validity d) alternate-forms reliability e) content validity f) none of the above