What does the infant mortality rate suggest about a country’s economy

The infant mortality rate (IMR) is often regarded as a barometer for overall welfare of a community or country. As such, it has been used by researchers as an outcome to be explained or as an explanatory variable to capture the socioeconomic development of a country.

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answer; i believe the correct answer is (4) flip a coin as each participant arrives,heads indicates assignment to the first group: tails indicates assignment to the second group;