Sample size and the detection of means: A signal detection account

Using statistical theory as a basis, Kareev (e.g., 1995) claimed that people's ability to correctly infer the existence of a population correlation should be greater for small than for large samples. Simulations by R. B. Anderson, Doherty, Berg, and Friedrich (2005) identified conditions favoring small samples but could not determine whether such an advantage was due to sampling skew, variance, or central tendency displacement. In the present study, we investigated theoretical effects of sample size (n) on the detection of population means under circumstances in which sampling variance is unconfounded with skew or central tendency displacement. The results demonstrate an extremely limited, criterion-specific, small-sample advantage that was attributable to n-related sampling variance and that occurred only with highly conservative, suboptimal criterion placement.     

Sociodemographic and psychological predictors of changes in dietary fat consumption in adults with high blood cholesterol following counseling in primary care.

The associations between sociodemographic variables, psychological factors, and changes in dietary fat consumption over 4 months were assessed in a randomized controlled trial of behavioral counseling versus standard advice. Patients were 141 men and 150 women, with an average age of 52.1 years and total cholesterol level of 7.27 mmol/l (278 mg/dl). Smokers, younger patients, and those with greater body mass index had higher fat intake at baseline. Behavioral counseling led to greater reductions in fat intake than did standard advice. Self-efficacy and ratings of benefits of low-fat diets were related to fat consumption at baseline, and changes in these measures were correlated with changes in fat intake. Family support, baseline anticipated regret, and (for the behavioral counseling group only) baseline behavioral intentions predicted reductions in fat intake. The results indicated that psychosocial variables associated cross-sectionally with fat consumption do not necessarily predict change and that factors involved in the process of change and the prediction of change need to be differentiated.     

Teaching preschool children to report suspicious packages to adults

Law enforcement agencies stress that public reporting of terror‐related crime is the predominant means for disrupting these actions. However, schools may be unprepared because the majority of the populace may not understand the threat of suspicious materials or what to do when they are found on school grounds. The purpose of this study was to systematically teach preschool children to identify and report suspicious packages across three experiments. In the first experiment, we used multiple exemplar training to teach children to identify the characteristics of safe and unsafe packages. In the second experiment, we taught participants to identify the locations where packages should be considered unsafe. Finally, in the third experiment, we used behavioral skills training to teach participants to avoid touching unsafe packages, leave the area where they were located, and report their discovery to an adult. Results suggest the participants quickly developed these skills. Implications for safety skills in young school children are discussed.     

Divorce Ambivalence and Reasons for Divorce in Iran

This study examined divorce attitudes and reasons for divorce in Iran, a nation experiencing a rapid increase in divorce. Using instruments translated into Farsi with a sample of 230 Iranian spouses filing for divorce, we found a preponderance of common relational reasons for divorce (such as growing apart and not getting enough attention), along with high rates of interpersonal violence reported by wives. Study participants showed considerable rates of divorce ambivalence, along with openness to reconciliation services. The findings were compared with similar studies of the United States spouses in the divorce process. Clinical implications include a careful approach to considering how discernment counseling might be adapted to the cultural situation of Iran, and particularly the special concerns of Iranian women.     

Influence of video‐mediation on adult–child interviews: implications for the use of the live link with child witnesses

The impact of high bandwidth video links on children's abilities to give evidence about a neutral event was investigated. Thirty‐two 6‐year‐olds and 32 10‐year‐olds took part. Each child was interviewed by a trained adult either face‐to‐face or across a live video link. Face‐to‐face and video condition interviews did not differ in terms of: total correct information; relevant information given during narrative recall; or the style of questioning required. However significantly more incorrect information was given during specific questioning in the face‐to‐face interviews, and younger children were significantly more resistant to leading questions in the video condition. Some gestural information was lost in the video condition due to camera angles. Furthermore, older children produced more information during free narrative recall in face‐to‐face interviews. Positive effects of the video condition are interpreted as due to decreasing social distance. Negative effects are associated with attenuation of visual cues. Copyright © 2000 John Wiley & Sons, Ltd.     

Long-term retention of information about presentation modality by children and adults

A mixed-modality continuous recognition task followed by a final recognition test after 0 h, 4 h, 1 day, or 7 days was administered to third- and fourth-grade children and adults. Subjects gave recognition responses and reported presentation modalities. Forgetting rates for both words and input mode were invariant with age. The decay functions for presentation modality were affected, however, by the initial input mode, with modality identification declining more rapidly for words heard first than for words seen first. Information about whether a word was seen or heard remained in memory for at least 4 h. The results demonstrate that long-term-memory representations contain a great deal of information about input mode and suggest that the theoretical distinction between automatic and effortful processing may be a useful one.