21. A random sample of 64 elements is selectedfrom a population. The sample mean

Question

21. A random sample of 64 elements is selectedfrom a population. The sample mean is 900, the population mean is1000, and the population standard deviation is 80. What is thestandard deviation of the sample mean?

A. 12.5 B. 839

C. 1000 D. 64

E. 10

22. Randomly choosing a name in the phone book,and then sampling each one hundredth name after is an example ofwhich type of sampling?

A. simple random B. cluster

C. systematic D. stratified

E. none of the above

23. =

A. P(test statistic = parameter value stated inH0)

B. P(accept H0when H0 is true) C. P(accept H0when Ha is true)

D. P(reject H0when H0 is true) E. P(reject H0when Ha is true)

24. H0 and H1 are

A. conflicting hypotheses which are subjected toreal world data for an indication of the truehypothesis.

B. statements about what happens in thesample.

C. statements about overlapping population valueswhich must be separated with a critical value.

D. probabilities of Type II and Type I errors,respectively.

25. If we increase the sample size, what happensto the margin of error?

A. It increases.

B. It decreases.

C. It remains the same.

D. B cannot be changed

Explanation / Answer

18. B. 85 19.D. 578 20.B. Approaches a normal distribution 21.E. 10 22.C. systematic 23.D. P(reject H0when H0 is true) 24.A. conflicting hypotheses which are subjected toreal world data for an indication of the true hypothesis. 25. B. It decreases.

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

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