Carl the farmer has three fields of tomatoes, on one he used no fertilizer, in another he used organic fertilizer, and the third he used a chemical fertilizer. He wants to see if there is a difference in the mean weights of tomatoes from the different fields. The sample data is given below. The second table gives the results from an ANOVA test. Carl claims there is a difference in the mean weight for all tomatoes between the different fertilizing methods.

	Tomato-Weight in Grams										$\bar x$
No Fertilizer	103	106	128	127	123	108	109	98	115	115	113.2
Organic Fertilizer	127	112	125	128	140	127	122	156	118	138	129.3
Chemical Fertilizer	125	151	160	138	143	125	131	134	113	121	134.1

ANOVA Results
$F$	$P$-value
7.70311	0.00225481

(a) Test Carl's claim at the 0.05 significance level.

There is sufficient evidence to conclude that the population means are not equal.
Yes
No

(b) Does your conclusion change at the 0.01 significance level?
Yes
No