Q1) Is this an experiment or an observational study? Select one. A) Experiment B

Question

Q1) Is this an experiment or an observational study? Select one.

A) Experiment               B. Observational Study

Q2) What type of study design was used? Select one.

A) Independent Groups

B) Paired with Repeated Measures  

C) Paired with Matching

Q3) Write the null and alternative hypothesis in proper notation  

Patients with chronic obstruction pulmonary disease (COPD) volunteered to be tested for exhaled nitric oxide (eNO) while resting and after a 6 minute walk test. Each subject was measured under each condition, and the order of presentation (resting then walking or the other way around) was randomized. Researchers believe the eNO should be higher while walking than resting for COPD patients. The data are summarized in the table below. Assume the distributions of eNO while walking, while resting, and the differences are all not heavily skewed.

Explanation / Answer

1)

patients with COPD volenteered to be tested for eNO while resting and after a 6 minute walk test. each subject was measured under the condition and order of presentation . so this is an observational study.

2)

we have given  each subject was measured under the  condition and order of presentation resting ten walking or the other way arround was randomised so the paired with repeated measures study will be use.

3)

now,

Null Hypothesis is,

H0=eNo should be higher while walking than resting for COPD patients.

and alternative hypothesis is,

H1=eNo should not be higher while walking than resting for COPD patients.

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