2. To explore the protective effect of ginsenoside Rg1 on cadmium-induced testicular damage in rats, the researchers

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2. To explore the protective effect of ginsenoside Rg1 on cadmium-induced testicular damage in rats, the researchers chose 10 litters of male rats of the same species with three rats in each litter. They randomly assigned them to three different treatment groups. The control group rats were intraperitoneally injected with normal saline. The cadmium chloride group rats were similarly injected with cadmium chloride solution. The rats in the Rg1 plus cadmium chloride group were given Rg1 by gavage before an intraperitoneal injection of cadmium chloride solution. After 2 weeks, the metallothionein (MT)

levels in the rats’ testes were measured (μg/g). The results are given in Table 10.24.

(a) State the H0 and H1 .

(b) What assumptions should the data satisfy when ANOVA is performed?

(c) Use appropriate methods to analyze the data and interpret the results.

(d) If the one-way ANOVA is performed not taking into consideration the block effect, what is its influence?

(e) What should be done if the block is not statistically significant? Give your reasons.

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