vi. Reasons for confidence

We can’t be completely certain about our predictions as there are a number of factors that could be affecting the amount of sea ice. One of these factors is possibly global temperatures which is affected by sun spots (NASA, 2014).

We can't be completely certain about our predictions as there are a number of factors that could be affecting the number of male live births. One of these factors is the economic conditions as when times are tougher people think more before having children, so it depends on what happens to New Zealand’s economy as to how many live births there are likely to be.