Statistical Analysis of Test Scores

Hard Unit 1: Scientific Foundations Statistical Analysis

During a psychological study examining the effects of sleep deprivation on cognitive performance, researchers conducted an analysis of the subjects' test scores using several statistical measures. The researchers reported that the average test score (mean) was 75 with a standard deviation of 10. They also noted that about 68% of the subjects scored between 65 and 85. Based on this information, which of the following conclusions is most accurate regarding the distribution of test scores?

The test scores are perfectly normally distributed.

More than 95% of subjects scored between 55 and 95.

The majority of subjects scored below the mean.

Approximately 34% of subjects scored between 75 and 85.

The standard deviation indicates a high level of variance among test scores.

Hint

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