ul2. Chapter 8 Quiz is Question: 1 pt Time Remal 8 of 16 (14 simple random sotta

Question

ul2. Chapter 8 Quiz is Question: 1 pt Time Remal 8 of 16 (14 simple random sottaned from a population wit -67 and 18. a) What must be true regarding the distribubon of the population in order to use the normal model to compute probabilties involving the sample mean? Assuming thhis con is tue, descibe the sampling dstibution of b) Assuming the normial (c) Assuming the normal model can be used, detormine Px 2 68 7) (a) What must be true regarding the distrbution of the population? O A. The population must be normally distributed O B. The popuiation must be nomaly distributed and tho sample size must be large O C. The sampling distribution must be assumed to be nomal D. Since the sample sze is large enough, the population distribution does not need to be nomal Assuming the normal model can be used, describe the sampling distributon i Choose the correct answer bel 18 O B. Approomately normal , with 67 and a,18 37 (b) P(x

Explanation / Answer

a) option D is correct

option A is correct

b) P(Xbar<71.4)=P(Z<(71.4-67)/(18/(37)1/2))=P(Z<1.4869)=0.9315

c)P(Xbar>68.7)=P(Z>(71.4-68.7)/(18/(37)1/2)=P(Z>0.9124)=0.1808

Related Questions

Navigate

• Browse (All)
• Browse U
• Subjects

---

---

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