Sample proportions from two random sample of sizes 12 and 10 denoted by p₁=0.6 and p₂=0.38

For testing H₀:₁=₂(say ) vs H₁: ₁₂using =0.05, p₁and p₂are pooled to create a singlevaluethat gives Z_STAT=1.03. The following statement (s) for testing H₀is/are true

a.Z_STATwill be valid and efficient test statistic

b. H₀is accepted because Z_STAT< Z_/2from normal distribution table.

c.is unbiased estimate for under H₀.

d. All of statements in a, b, c are true