1. A salesman for home insulation conducted a telephone poll of the first 25 people from his firm's client list. He asked each person this question: Home insulation is one of the best ways to reduce your monthly heating bill. On a scale of 1 to 7, where 1 is unimportant and 7 is extremely important, how important is it to you to have adequate home insulation? All but one responded with a rating of 5 or above. The salesman wrote to his manager that "96% of people in our town think that insulation is very important."

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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1. A salesman for home insulation conducted a telephone poll of the first 25 people from his
firm's client list. He asked each person this question:
Home insulation is one of the best ways to reduce your monthly heating bill.
On a scale of 1 to 7, where 1 is unimportant and 7 is extremely important, how important is it to
you to have adequate home insulation?
All but one responded with a rating of 5 or above. The salesman wrote to his manager that
"96% of
people in our town think that insulation is very important."
Are the survey results valid? Why or why not? (Hint: Discuss sample size, question,
sample technique, and survey technique)
Transcribed Image Text:1. A salesman for home insulation conducted a telephone poll of the first 25 people from his firm's client list. He asked each person this question: Home insulation is one of the best ways to reduce your monthly heating bill. On a scale of 1 to 7, where 1 is unimportant and 7 is extremely important, how important is it to you to have adequate home insulation? All but one responded with a rating of 5 or above. The salesman wrote to his manager that "96% of people in our town think that insulation is very important." Are the survey results valid? Why or why not? (Hint: Discuss sample size, question, sample technique, and survey technique)
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