A developmental psychologist would like to know whether success in one specific area can affect a person’s general self-esteem. The psychologist selects a sample of 25 ten-year-old children who all excel in athletics. These children are given a standardized self-esteem test. In the general population of ten-year-olds, the scores on the standardized self-esteem test are normally distributed with a mean of 70. The mean score for the sample is 72 with a standard deviation of 5. Correct decision and conclusion? Use the .05 significance level

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.