3. A sample of 41 people who lived near a nuclear plant were asked about their attitude toward nuclear energy six moths before an accident occurred at the plant The same 41 people were asked again three months after an accident. The mean attitude score was 70 70 prior to the accident, and 67 after the accident. The estimated standard error of the mean difference (i.e., s-hat of D-bar) was 1.52. The observed value of t is------------.
a.+1.974
b..+2.400
c.-1.974
d.+12.658
For which of the following study designs would a related -group t- test be most appropriate?
a. comparing self-esteem for students who participant in school athletics versus those who do not
b. comparing verbal solving skills for science majors versus art majors at a college
c.comparing one's pain tolerance with and with and without acupuncture therapy
d. comparing mathematical skills for randomly selected girls versus boys at age 10
Answer - 1: Observed value of t = (70 - 67)/1.52 = 1.974
Option A is correct.
Answer - 2: Comparing one's pain tolerance with and with and without acupuncture therapy
Option C is correct.
3. A sample of 41 people who lived near a nuclear plant were asked about their...