A Medical Devices Company Wants to Know the Number of Hours

question 108

Multiple Choice

A medical devices company wants to know the number of hours its MRI machines are used per day. A previous study found a standard deviation of four hours. How many MRI machines must the company find data for in order to have a margin of error of at most 0.5 hour when calculating a 98% confidence interval?

• A) 346.26
• B) 347
• C) 424.69
• D) 425

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Definitions:

Interquartile Range

The Interquartile Range is a statistical measure of variability, defined as the difference between the upper and lower quartiles, used to describe the spread of data points in a dataset.

Mean

Mean is a statistical measure representing the average value in a set of numbers, calculated by adding all the values together and dividing by the number of values.

National Mean

The average score of a given population on a particular test or assessment.

Graduate Program

An advanced course of study that follows a bachelor's degree, typically leading to a master's or doctoral degree.