296) The arithmetic mean is an average that is calculated by adding up a set of quantities and dividing the sum by the total number of quantities in the set. Answer: TRUE Explanation: Statement of fact. 297) Descriptive statistics are statistical procedures that organize and summarize research data. Answer: TRUE Explanation: Statement of fact. 298) The standard deviation is a commonly used measure of variability that indicates the average difference between scores in a distribution and their mean. Answer: TRUE Explanation: Statement of fact. 299) The standard deviation is an average that is calculated by adding up a set of quantities and dividing the sum by the total number of quantities in the set. Answer: FALSE Explanation: This is a definition of a mean, not a standard deviation. 300) Inferential statistics are statistical procedures that organize and summarize research data. Answer: FALSE Explanation: This is a definition of descriptive statistics, not inferential statistics. 301) If the results of research are not significant at the .05 level then the researchers conclude that their hypothesis was not supported. Answer: TRUE Explanation: Statement of fact. 302) Results from cross-sectional studies find that older people perform as well as younger individuals on tests of mental functioning. Answer: FALSE Explanation: Results from longitudinal, not cross-sectional studies give these results. 303) A study in which subjects of different ages are compared at a given time is called a longitudinal study.
296) The arithmetic mean is an average that is calculated by adding up a set of quantities and dividing the sum by the total number of quantities in the set. Answer: TRUE Explanation: Statement of fact. 297) Descriptive statistics are statistical procedures that organize and summarize research data. Answer: TRUE Explanation: Statement of fact. 298) The standard deviation is a commonly used measure of variability that indicates the average difference between scores in a distribution and their mean. Answer: TRUE Explanation: Statement of fact. 299) The standard deviation is an average that is calculated by adding up a set of quantities and dividing the sum by the total number of quantities in the set. Answer: FALSE Explanation: This is a definition of a mean, not a standard deviation. 300) Inferential statistics are statistical procedures that organize and summarize research data. Answer: FALSE Explanation: This is a definition of descriptive statistics, not inferential statistics. 301) If the results of research are not significant at the .05 level then the researchers conclude that their hypothesis was not supported. Answer: TRUE Explanation: Statement of fact. 302) Results from cross-sectional studies find that older people perform as well as younger individuals on tests of mental functioning. Answer: FALSE Explanation: Results from longitudinal, not cross-sectional studies give these results. 303) A study in which subjects of different ages are compared at a given time is called a longitudinal study.
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