A sample of 30 households showed that the sample mean of back-to-school spending is $622.85. It is believed that back-to-school spending is normally distributed with a population standard deviation of $65. An analyst wishes to test if the average back-to-school spending differ from $606.40 per family predicted by the trade group at the 5% significance level.

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The pvalue is 1.646 which is greater than the level of significance 0.05

This tells us to accept the null hypothesis.

P-value is 0.1646 > significance level.

We do not reject the null hypothesis.

So we can not say that average back to school spending is different from 606.4 dollars per family

answer(d) sequencing and iteration;