1. A random sample of 15 households in Cebu City provided the following data on the number of kilowatt-hours (KWM) of electricity they consumed in a month: 618 615 520 522 614 478 568 623 558 485 592 618 575 630 468 Using 99% confidence level, the true average monthly electricity consumption in kWh is betwecn: Is the average monthly electricity consumptions of households in this city significantly different from the 620 kWh average morthly electricity consumptions of the Philippines? Yes / No

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A: Let's find.

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A: Answer

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A:

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A: 23.(i)

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A:

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A: