Exercise Program Delta causes weight loss of 6.3 pounds per year in morbidly obese women. e. Talking to a crying baby calms the baby more than ignoring it; picking up the baby calms it more than talking to it. f. Medication R15B, taken daily from age 13, completely controls cystic acne by age 23. ANS: C, D, E, F The findings of a study can be statistically significant but may not be clinically important. For example, one group of patients might have a body temperature 0.1° F higher than that of another group. Data analysis might indicate that the two groups are statistically significantly different. However, the findings have little or no clinical importance due to the small difference in temperatures between groups. Persons with dermatitis would find the UV light treatment almost miraculous. Two extra years of life may be clinically important to those with good quality of life. Increasing endorphins is not due only to petting cats, so this study is not particularly significant, clinically. A weight loss of 6.3 pounds per year is not large enough to make a significant difference in the life of a morbidly obese woman. Picking up crying babies is something that even one’s grandmother knows; this is not clinically useful. A medication that controls cystic acne ten years later is of little use to the adolescent who is miserable with acne. DIF: Cognitive Level: Analysis REF: Page 537 9. A measured value is within two standard deviations of the mean but not within one standard deviation, and it is greater than the mean. The distribution is very close to a normal distribution. What does this signify? (Select all that apply.) a. This particular value is not an outlier. b . In the data set, almost 2/3 of the values are closer to the mean than this one is. c. The data point falls within the majority of the measured values, in terms of its closeness to the mean. d . In the data set, at least 4% of the values are further from the mean than this particular value is. e. In this data set, between 65% and 95% of the values are smaller in value than this one is. ANS: A, B, D, E The range, standard deviation, and variance are statistics that describe the extent to which the values in the sample vary from one another. The most common of these statistics to be reported in the literature is the standard deviation, because of its direct association with the normal curve. If the frequency distribution of any given variable is approximately normal, knowing the standard deviation of that variable allows the reader to know what percentages of subjects’ values on that variable fall between +1 and –1 standard deviation. In a normal distribution, when a standard deviation is calculated, 34.13% of the values are between the mean score and 1 standard deviation above the mean. Similarly, 34.13% of the values are between the mean score and 1 standard deviation below the mean. The middle 95.44% of the subjects’ scores are between +2 standard deviations and –2 standard deviations.
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- Fall '16
- Denise Cauble
- Nursing, researcher, Cognitive Level