Exercise 07.51 Algorithmic Question 3 of 3 Check My Work (2 remaining) A market research firm...

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Answer 1

Answer #1

Ans:

Sampling distribution of sample proportion:

mean=p=0.4

standard deviation=sqrt(0.4*(1-0.4)/400)=0.0245

sample proportion=150/400=0.375

z=(0.375-0.4)/0.0245=-1.021

P(z>=-1.021)=P(z<=1.021)=0.8464

*(without rounding off it will be 0.8463)

Answer 2

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