4. Opthamologists want to compare the speed with which the eye focuses on object

Question

4. Opthamologists want to compare the speed with which the eye focuses on objects that are near to the eye, with the speed of focusing on objects that are far away. They randomly assign 40 patients to one of two groups. One group focuses on objects that are four feet away; the other on objects that are 30 feet away. The opthamologists measure the time required for the eye to focus (in milliseconds). Which of the confidence intervals below would be most appropriate for this study? , when is known , when is unknown The true mean of the differences, for paired data The difference between two means, using independent samples One proportion The difference between two proportions The slope of a regression line

Explanation / Answer

4.

They randomly assign 40 patients to one of two groups.

Hence, we have 2 independent groups.

As we measure the time required to focus, then

OPTION D: The difference between two means, using independent samples [ANSWER]

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