Szalacha Erkut Coll Alarcon Fields and Ceder in 2003 investi

Szalacha, Erkut, Coll, Alarcon, Fields, and Ceder in 2003 investigated the research hypothesis that Puerto Rican children in the US who report or perceive discrimination will have more mental health problems and higher school-related stress than Puerto Rican children who do not perceive discrimination. The researchers presented the table below with scores on the Reynolds Child Depression Scale (RCDS).

Perceived Discrimination

Yes (n = 36)

No (n = 255)

Variable

m

SD

m

SD

t (289)

RCDS

1.90

.51

1.71

.44

2.39*

Note: *p < .05

Which of the following formulas would be used to construct the 95% confidence interval for these data?

Choose one answer.

Solution

To compute a confidence interval for the difference between mean for the two data use the following formula:

(1.90-1.71) plus and minus (standard error of mean differences)(t critical value)

0.19 plus and minus (standard error of mean differences)(t critical value