what would be 95% prediction interval for the number of new PI case

what would be 95% prediction interval for the number of new PI case

Please check out the case in the attachment and answer what would be 95% prediction interval for the number of new PI cases where advertising expenditure is equal to $100,000?

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u5c4fu5e55u5febu7167 2015-04-10 u4e0bu53484.51.04.png