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An investigator is studying the difference in women’s readiness to be discharged from the hospital between women who had a vaginal birth and those who had a cesarean section. She sets her level of significance at 0.05. Her calculated p value is 0.27. What conclusion would she make?

An investigator is studying if the number of servings of vegetables consumed is related to age. They report the sample’s age had a mean of 45.8 years and a standard deviation of 21.3 years. In this study, what level of measurement is age?

Researchers distributed two questionnaires in an endocrine clinic waiting room. One questionnaire measured the amount of social support the patient reported receiving and the other question measured the patients’ feelings of competence in self-managing their diabetes. After analyzing the data, they found that patients who reported high levels of social support also reported high levels of competence and patients who reported low levels of social support also reported low levels of competence. This describes:

An investigator studied the effect of music therapy on pain ratings among children following a tonsillectomy. She wanted to determine if music therapy was more effective among certain ages of children as compared to other ages. She divided her sample into the following age groups: infants, toddlers, preschool-aged children, school-aged children, and adolescents. In this study, the age groups are:

Which statement about measurements is FALSE?

Which of the following is an example of a null hypothesis?

A researcher conducted a study examining hearing tests of 100 children. She reported that subjects ranged from 3-9 years old (mean = 6 years, SD = 1 year). How many standard deviations below the mean was the youngest participant?

Using volunteers as subjects in a study,

An investigator collects data that are normally distributed with a mean score of 50 and a standard deviation of 10. Approximately 95% of the scores would fall between which two numbers?

A researcher wants to study the effect of vitamin D intake on muscle strength. She randomly assigns subjects to either an experimental group who receive Vitamin D supplementation or a control group who are given a placebo pill that does not contain any active ingredient. She measures subjects’ muscle strength before beginning supplementation and then 6 months after the subjects had been receiving daily supplementation. This is an example of: