Question: QUESTION 3 A journal article reports that a random sample of 20 antivirus software packages was used as a basis for calculating a 90%

QUESTION 3 A journal article reports that a random sample of 20

QUESTION 3 A journal article reports that a random sample of 20 antivirus software packages was used as a basis for calculating a 90% t-based confidence interval for the true mean annual cost of an antivirus software in UAE. The resulting interval was (255 Dhs, 291 Dhs). What is the sample standard deviation used when computing the interval? Round your answer to two decimale places.

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