Question

5) Fred’s Space Flight service wants to estimate how many people would want to live permanently...

5) Fred’s Space Flight service wants to estimate how many people would want to live permanently in a city orbiting the Earth. They want to be 90% confident that their sample percentage is within 2.5% of the true population value. In a survey of people who would want to live on Mars suggests that this percentage should be 68%. How large must their sample be?

8......

1) Find the χL2 and χR2 values for a sample of 29 scores and a confidence level of 95%.

Homework Answers

Answer #1

5)

Given that,

= 0.68

1 - = 0.32

margin of error = E = 0.025

Z/2 = 1.645

sample size = n = (Z / 2 / E)2 * * (1 - )

= (1.645 / 0.025)2 * 0.68 * 0.32

= 942.1

sample size = n = 943

8)

Given that,

n = 29

df = 28

2L = 2/2,df = 1.746

2R = 21 - /2,df = 15.308

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