Question

In a study about hemoglobin level in pregnant and non-pregnant women, the mean levels in the two groups were 12 gm/100ml and 14gm/100ml respectively. A test of significance between the means of the two groups was carried out and the difference was found significant at p<0.05, this means that the difference
1. May be attributed to chance
2. Could be random
3. Is true and is unlikely to be by chance
4. Cannot be tested due to insufficient data

Answer 1

Answer:

3. Is true and is unlikely to be by chance