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The t-Test and ANOVA for Weight Loss Comparison

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The t-Test and ANOVA for Weight Loss Comparison

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Questions and Answers

What is the appropriate statistical test for comparing weight loss in 2 groups?

ANOVA

Z-test

Chi-square test

t-Test (correct)

At what confidence level is the weight loss comparison conducted?

90%

85%

95% (correct)

99%

What does a t statistic of -3.7 indicate in the weight loss example?

No statistical significance in the weight loss

Statistically significant weight loss in intervention group (correct)

Statistically significant weight loss in control group

Need more information to interpret the t statistic

How should odds ratios (ORs) be interpreted in relation to relative risks (RRs), based on the text?

They should be interpreted using the same wording as RRs Signup and view all the answers

What type of analysis was used in the study?

Survival analysis Signup and view all the answers

Which variable was the primary predictor of interest in the study?

Hospital readmission Signup and view all the answers

What did the unadjusted hazard ratio (HR) for early hospital readmission indicate?

Higher risk of death than late hospital readmission Signup and view all the answers

What did the difference between unadjusted and adjusted HRs suggest?

Presence of confounding effect Signup and view all the answers

What is the main difference between hazard ratio (HR) and relative risk (RR) in the context of survival over time?

HR uses information collected at different times, while RR is the ratio of two probabilities calculated for the entire study period Signup and view all the answers

How does the hazard ratio (HR) differ from relative risk (RR) when considering survival rate in cirrhosis patients?

HR considers information collected at different times, while RR calculates the probability of the event in one group compared to the probability in the other group Signup and view all the answers

What is the relationship between hazard ratio (HR) and relative risk (RR) as the time interval lengthens?

HR and RR diverge Signup and view all the answers

In the context of survival over time, which measure is useful when the risk is not constant with respect to time?

Hazard ratio (HR) Signup and view all the answers