STAT 330: 95-3
The P-value is the area in the right hand tail since we would reject for large z values. We find and conclude that there is only weak evidence that the referendum will not pass.
and the one-tailed P-value is P= 0.0008 so that we conclude that the proportion supporting NO has definitely increased.
which is, in units of micrograms above 10 grams, 496 .
which leads to a two sided P value of 0.052. (From the tables you can tell that P is very close to 0.05 and a bit bigger than 0.05.) Thus we conclude that there is rather marginal evidence of a change in weight.
The questions gives the denominator the value 5 so we get