6. In year 2022 a random sample of 35 households in Ottawa found that the average annual internet service cost per houschold was $1755 with a sample standard deviation of $600.00. (a) Construct a 90% confidence interval for the average annual internet service cost per household. (b) In year 2018 the average annual cost of internet services per household was $2000. Does the sample data show that these average annual costs have declined since 2018? Use a - 0.I to do the test.

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Author:Amos Gilat
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6. In year 2022 a random sample of 35 households in Ottawa found that the average annual
internet service cost per household was $1755 with a sample standard deviation of
$600.00.
(a) Construct a 90% confidence interval for the average annual internet service cost per
household.
(b) In year 2018 the average annual cost of internet services per household was
$2000. Does the sample data show that these average annual costs have declined since 2018?
Use a - 0.I to do the test.
Transcribed Image Text:6. In year 2022 a random sample of 35 households in Ottawa found that the average annual internet service cost per household was $1755 with a sample standard deviation of $600.00. (a) Construct a 90% confidence interval for the average annual internet service cost per household. (b) In year 2018 the average annual cost of internet services per household was $2000. Does the sample data show that these average annual costs have declined since 2018? Use a - 0.I to do the test.
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