Final answer:
This college-level statistics question examines the effects of the drug diazepam on cognitive function using mean digit span scores, standard deviations, sample sizes, and 95% confidence intervals for various dosage levels to understand drug efficacy and cognitive impact.
Step-by-step explanation:
The question relates to the field of Statistics, specifically to the use of confidence intervals in examining the effects of varying dosages of diazepam on digit span tasks. A study conducted manipulated the amount of the drug diazepam and measured its effect on digit span task performance, with the results presented in terms of mean scores, standard deviations, sample sizes, and 95% confidence intervals for the mean scores. The goal is to understand whether different doses of diazepam affect cognitive function, as measured by the digit span task.
The 95% confidence interval is a range of values that is believed to contain the true mean of the population with a level of certainty (in this case, 95%). The research includes the statistical analysis of these confidence intervals to investigate if the mean digit span score changes with different drug dosages. This type of analysis is pivotal in the evaluation of pharmaceutical drugs, allowing researchers to understand the effectiveness and potential cognitive effects of substances such as diazepam.