a) Construct a 96% confidence interval for the proportion of Greeks who are "suffering". • Provide the formula for the confidence interval • Find the lower and upper limits. Show your work. Interpret your result. (Write a complete sentence.) b) Without doing any calculations, would the confidence interval widen, narrow, or stay the same if we used a higher confidence level? c) Without doing any calculations, would the confidence interval widen, narrow, or stay the same if we increase the sample size? ) Suppose we wanted the margin of error for the 96% confidence interval to be 1.5%. Using p 0.25 as an estimate, how large a sample size would we need? (Show your work. Your final answer should be given as a whole number.) %3D

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Greece has faced a severe economic crisis since the end of 2009. A Gallup poll surveyed 1,000 randomly selected
Greeks in 2011 and found that 25% of them said they would rate their lives poorly enough to be considered
"suffering".
a) Construct a 96% confidence interval for the proportion of Greeks who are "suffering".
• Provide the formula for the confidence interval
• Find the lower and upper limits. Show your work.
• Interpret your result. (Write a complete sentence.)
b) Without doing any calculations, would the confidence interval widen, narrow, or stay the same if we used a
higher confidence level?
c) Without doing any calculations, would the confidence interval widen, narrow, or stay the same if we increase the
sample size?
d) Suppose we wanted the margin of error for the 96% confidence interval to be 1.5%. Using p=0.25 as an
estimate, how large a sample size would we need? (Show your work. Your fınal answer should be given as a whole
number.)
Type out your answers below. Label your answers a), b),.. d). All numbers should be accurate to 4 decimal places,
unless otherwise indicated. If you need to convert numbers to percentages, round the percentages to 2 decimal
places.
BIUA A I E E 3I I x x, E E
E- 2 V T T 12pt
Paragraph
!!! O
Transcribed Image Text:Greece has faced a severe economic crisis since the end of 2009. A Gallup poll surveyed 1,000 randomly selected Greeks in 2011 and found that 25% of them said they would rate their lives poorly enough to be considered "suffering". a) Construct a 96% confidence interval for the proportion of Greeks who are "suffering". • Provide the formula for the confidence interval • Find the lower and upper limits. Show your work. • Interpret your result. (Write a complete sentence.) b) Without doing any calculations, would the confidence interval widen, narrow, or stay the same if we used a higher confidence level? c) Without doing any calculations, would the confidence interval widen, narrow, or stay the same if we increase the sample size? d) Suppose we wanted the margin of error for the 96% confidence interval to be 1.5%. Using p=0.25 as an estimate, how large a sample size would we need? (Show your work. Your fınal answer should be given as a whole number.) Type out your answers below. Label your answers a), b),.. d). All numbers should be accurate to 4 decimal places, unless otherwise indicated. If you need to convert numbers to percentages, round the percentages to 2 decimal places. BIUA A I E E 3I I x x, E E E- 2 V T T 12pt Paragraph !!! O
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