Test: Chapter 9 Test Submit Test This Question: 1 pt 11 of 15 (4 complete) This

Question

Test: Chapter 9 Test Submit Test This Question: 1 pt 11 of 15 (4 complete) This Test: 15 pts possibl People were polled on how many books they read the previous year Initial survey results indicate that s 12 7 books Complete parts (a) through (d) below d How many su y cts are needed to estmate the mean number of books road the pro ous year than sa books wen ons conhdence? This 99% confidence level requires [ subjects (ound up to te nearest sutjed ) Compare this result to part (a) How does increasing the level of confidence in the estmate affect sample size? Why is thes reasonable? O A. Increasing the level of confidence increases the sample size requred For a fxed margin of error, greater confidence can be achieved with a larger sample size B. increasing the level of con ence increases the sample see re red For a fxed mar n of emor greater conto nce can be ache ed wit a smaler san pla sure. C. Increasing the level of confidence decreases the sample sze re ured For a hxed mar n of orror groater conf o co can be achi od wth a smaior sample so O D. Increasing the level of confidence decreases the sample sze required For a fixed margin of error groator confidence can be achieved with a larger sample size Click to select your answerts). O Type here to seardh 7

Explanation / Answer

we know that n = [z*s/E]^2

  =[2.5748*12.7/6]^2

= 29.7024

= 30 when rounded up

option1 , increasing confidence intervel increses sample size for fixed margin, greater confidence can acheived with greater sample size.

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