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im stcuj in trying to figure out the zscore. I would appreciat this. I got -1.28 for it but im having doubts it could be

im stcuj in trying to figure out the zscore. I would appreciat this. I got -1.28 for it but im having doubts it could be 1.28. Thank you

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Q7. Sample size. Determine the sample size needed to construct a 80% condence interval to estimate the population mean when a population standard deviation =20 with the width of the interval equal to 18. (case 1, chapter 8)

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