Note: Answer the Question s) by Using the TI-30XA (or other approved) Calculator

Question

Note: Answer the Question s) by Using the TI-30XA (or other approved) Calculator RTANT: Make sure you carry all decimals untl you reach your answer, then round to four decimals IMPO 10 12 showed that 46% of us. employers were likely to require higher employee contributions for health care 14 15 A recent survey coverage. Suppose the survey was based on a sample of 70 companies. Find the 80% confidence interval for the proportion of all companies likely to require higher employee contributions for health care coverage. (Se 16 17your textbook for a similar problem.) 18 19 20 21 e exercise 40 on page 370 of Left Endpoint 23 24 25 26 27 Right Endpoint Click to Grade Your Work

Explanation / Answer

Sol:

p=46%=0.46

n=700

80% confidence interval for population proportion is

p-zcrits*sqrt(p(1-p)/700,p+zcrits*sqrt(p(1-p)/700

0.46-1.28sqrt(0.46(1-0.46)/700),0.46+1.28sqrt(0.46(1-0.46)/700)

0.4359,0.4841

0.4359<p<0.4841

left end point=0.4359

right end point=0.4841

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