03 Lesson Scientific Method II

# 03 Lesson Scientific Method II - Scientific Method...

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Scientific Method II (Statistics and Methodological Problems) ASSIGNMENT a. Study text Chapter 2 (pg. 52-69), and Appendix B (A-8 - A-14). b. Complete Concept Checks 2.3 (pg 55) and 2.4 (pg 59). c. Review Questions: Chapter 2 practice test questions 9-15 (pg 71). d. Answer IPO 3. LESSON OBJECTIVE 3.1. Infer the meaning of descriptive and inferential statistical concepts in conducting scientific research. 3.2. Discuss methodological problems which could affect research findings. PERFORMANCE OBJECTIVES 3-1. Identify and Describe the three measures of central tendency. Median: the score that falls exactly in the center of a distribution of scores. Half of the scores fall above and half below Mean: the arithmetic averages of the scores in a distribution Mode: the most frequent score in a distribution 3-2. Describe the effects of outliers on the mean of large and small data sets. Generally the most useful measure because addition statistical manipulations can be performed on in that are not possible with median or mode However, it is sensitive to extreme scores which can sometimes be misleading 3-3. Describe the standard deviation. Standard Deviation: is an index of the amount of variability in a set of data, or how much the scores in a data ser vary from each other and from the mean When variability is great, the standard deviation will be large, and when the variability is low, the standard deviation will be smaller. 3-4. Describe the normal distribution. Normal distribution : a symmetric, bell-shaped cure that represents the pattern in which many characteristics are dispersed in the population 3-5. Describe the impact of variability on the distribution. If the variability is large, then there will be a much greater range in the data than if the variability is small. The “bell curve” will be more flatlined

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3-6. Differentiate between a positive and negative correlation. A correlation exists when two variable are related to each other Positive correlation: indicates that two variable co- vary in the same direction, in other words, when one increases so does the other and when on decreases so does the other Negative correlation: indicates that two variables co-vary in the opposite direction;
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03 Lesson Scientific Method II - Scientific Method...

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