Tо investigаte the effect оf glue supplier оn lаbel аdhesion, a crayon manufacturer ran an experiment with glue from four different suppliers. For each glue supplier, a random sample of 100 labeled crayons was selected, and the force required to peel off the label was measured. Assume that force is approximately normally distributed, and the variance is about the same for each supplier. Which statistical method should be used to test whether the mean force is the same for the suppliers?