Question

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1. most psychological data are distributed on a normal curve, in which two - thirds of the scores lie between one standard deviation above and one standard deviation below the ____.

mode
median
range
mean

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1. mathematical procedures that provide a measure of confidence about how likely it is that a certain result appeared by chance are known as ________.

measures of central tendency
statistical interference
descriptive statistics
inferential statistics

Explanation:

Question 3

In a normal distribution, the mean, median, and mode coincide. The normal curve's properties state that ~68% (two - thirds approx) of data lies within 1 standard deviation of the mean. Mode is the most frequent value, median is the middle value, and range is the spread. So the answer is mean.

Measures of central tendency (mean, median, mode) describe central values. Descriptive statistics summarize data. Inferential statistics use samples to make inferences about populations and assess if results are due to chance. "Statistical interference" is incorrect; it's inferential statistics.

Answer:

D. mean

Question 4