A random sample of size n-477 is taken from a population of size N variance o2-1

Question

A random sample of size n-477 is taken from a population of size N variance o2-177. Use Table 1. 9,800 with mean ?--65 and a-1. Is it necessary to apply the finite population correction factor? O Yes O No a-2. Caloulate the expected value and the standard error of the sample mean. (Negative values should be indicated by a minus sign. Round "standard error" to 2 decimal places.) Expected value Standard error b. What is the probability that the sample mean is between -67 and -637 (Round "2" value to 2 decimal places, and final answer to 4 decimal places Probability c.What is the probability that the sample mean is greater than-647 (Round "t value to 2 decimal places, and final answer to 4 decimal places.) Probability

Explanation / Answer

a-2)

expected value =-65

std error =sqrt(variance/n)=sqrt(177/477)=0.91

b)

P(-67<Z<-63)=P(-3.28<Z<3.28)=0.9995-0.0005=0.9990

c)

P(X>-64)=P(Z>1.64)=0.0505

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.