One sample has n = 5 scores and the second has n = 10 scores. If the pooled variance for the two samples is 30, what is the value of the estimated standard error for the sample mean difference?
a. 2 c. 9
b. ?2 d. 3
D
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According to Erikson, basic strengths are interdependent and one strength cannot develop until the strength associated with the previous psychological stage of personality development has been confirmed
Indicate whether the statement is true or false.
The text reported that nonshared environmental influences can be studied adequately by
a. studying archival records such as school grades. b. asking siblings whether they were treated differently while growing up. c. secretly observing children with hidden cameras. d. using microscopes to examine siblings' karyotypes.
Which of the following is not a practice dictated by the American Psychological Association's ethical guidelines for the use of human participants?
a. Participants must give informed consent prior to participating in a research project. b. Participants have the right to cease participation at any time. c. Participants must be debriefed at the conclusion of the study. d. Data collected from participants is not subject to confidentiality guidelines.
At the end of the first stage of labor, the cervix is dilated
a. one centimeter. c. seven to eight centimeters. b. five centimeters. d. 10 centimeters.