O a standard error of the proportion standard error of mean O c central limit th

Question

O a standard error of the proportion standard error of mean O c central limit theorem O d proportion deviation QUESTION 21 A population has a mean of 80 and a standard deviation of 8. A sample of 64 observations will be taken. The probabilty that the sample mean will be larger than 81i O a 0.4013 O b.00228 0.1292 40 1587 QUE STION 22 An estimate of a population parameter that provides an interval of values believed to contain the value of the paraeter is knoen as the 0 a population estimate O b interval estimate OType here to search 0.0

Explanation / Answer

1. it is called the standard error of the mean so the correct option is B

2. mean is 80 and s is 8. standard error for 64 observations is s/sqrt(N)=8/sqrt(64)=1

z is given as (x-mean)/s

thus, P(x>81)=P(z>(81-80)/1)=P(z>1)=1-P(z<1)

from normal distribution table we get 1-0.8413=0.1587

option D

Related Questions

Navigate

• Browse (All)
• Browse O
• Subjects

---

---

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