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Get Full Access to Elementary Statistics - 12 Edition - Chapter 1.4 - Problem 27bb
Get Full Access to Elementary Statistics - 12 Edition - Chapter 1.4 - Problem 27bb

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# indicate whether the observational study used is

ISBN: 9780321836960 18

## Solution for problem 27BB Chapter 1.4

Elementary Statistics | 12th Edition

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Problem 27BB

Problem 27BB

indicate whether the observational study used is cross-sectional, retrospective, or prospective.

Nurses' Health Study The Nurses’ Health Study was started in 1976 with 121,700 female registered nurses who were between the ages of 30 and 55. The subjects were surveyed in 1976 and every two years thereafter. The study is ongoing.

Step-by-Step Solution:
Step 1 of 3

Problem 27BB

Step1 of 3:

We have The Nurses’ Health Study was started in 1976 with 121,700 female registered nurses who were between the ages of 30 and 55. The subjects were surveyed in 1976 and every two years thereafter. The study is ongoing.

Step2 of 3:

We need to indicate whether the observational study used is cross-sectional, retrospective, or prospective.

Step3 of 3:

Let us understand what is cross sectional, retrospective and prospective

Consider,

1).Cross sectional: A cross-sectional study (also known as a cross-sectional analysis, transversal study, prevalence study) is a type of observational study that analyzes data collected from a population, or a representative subset, at a specific point in time that is, cross-sectional data.

2).Retrospective: The researcher looks at historical data for a group. Some of the people in this group have developed the disease, and some have not. This can result in finding out who has the disease and when they developed it.

3).Prospective: None of the subjects have the disease (or other outcome) being measured when the study commences data analysis happens after a period of time has elapsed.

This is a “prospective study” because, the study tracks a group of similar people (nurses) over a long period of time.

Step 2 of 3

Step 3 of 3

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