Corn yields (bushels per acre) for experimental plots controlled to have 1 weed per meter of row and 3 weeds per meter of row:

1 weed/meter - 166.2, 157.3, 166.7, 161.1

3 weed/meter - 158.6, 176.4, 153.1, 156.0

Explain carefully why a two-sample t confidence interval for the difference in mean yields may not be accurate.

The two-sample t confidence interval for the difference in mean yields may not be accurate because the sample size is less than 15 and it doesn't appear to have a Normal distribution.

Is that right?

Thanks in advance!