An experiment was conducted to investigate the the effectiveness of several insecticides. One-hundred insects of a particular species were put into a chamber and exposed to an insecticide for 15 seconds. The procedure was applied in random order six times for each of the four brands of insecticides (Brand A, Brand B, Brand C, Brand D). The number of dead insects out of 100 were observed for each chamber after exposure. To analyze the results, the investigators used ANOVA (Analysis of Variance). For this setting, what is the correct value for the degrees of freedom for the treatments

Apsychology student wishes to investigate differences in political opinions between business majors and political science majors at her college. she randomly selects 100 students from the 260 business majors and 100 students from the 180 political science majors. does this sampling plan result in a simple random sample? why or why not? no, because each group of 200 students in the sample does not have the same chance of being selected. yes, because each group of 200 students in the sample has the same chance of being selected. no, because each individual student does not have an equal chance of being selected. yes, because each individual student has the same chance of being selected.