The correct answers are ： The estimate is not reliable because X is outside the range of the data and The estimate is not reliable because the sample is small
When X = 20, we don't know anything about the relationship between X and Y since the sample data only goes up to X = 10. 'The estimate is not reliable because X is outside the range of the data 1 is therefore true.
Since a correlation coefficient of 0.8 would be regarded as strong (it is a high value) the estimate would be reliable. 'The estimate is not reliable because the correlation is low' is therefore not true.
With such a small sample and the extrapolation required, the estimate is unlikely to be reliable.
The estimate is reliable' is therefore not true.
The sample of only six pairs of values is very small and is therefore likely to reduce the reliability of the estimate. The estimate is not reliable because the sample is small' is therefore true.
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