4) In 2015, the mean household expenditure for energy was $ 1493 according to data published by the US Energy Information Association. Pratap is an economist and he thinks that this has changed significantly in 2018. In a random sample of 35 households he found that the mean expenditure for energy was $1618 with a standard deviation of $321. At the 5 % level of significance can we agree with Pratap?

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4) In 2015, the mean household expenditure for energy was $ 1493 according to data published by the US Energy Information Association. Pratap is an economist and he thinks that this has changed significantly in 2018. In a random sample of 35 households he found that the mean expenditure for energy was $1618 with a standard deviation of $321. At the 5 % level of significance can we agree with Pratap?

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