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After the new advertising campaign was launched, a marketing study found that the sample mean spending for 300 respondents in the 18–35 age group was $75.86, with a sample standard deviation of $50.90. Is there sufficient evidence to conclude that the advertising strategy significantly increased sales in this age group with significance level of 5%?

one sample test for mean

H0: Population mean -<70

H1: Population mean >70

18-35 group= 300 respondents, sample mean spending =$75.86, sample standard deviation=$50.90, Significance level 5%

Therefore, z=$(75.86-70)/50.90/root300 =1.994

Critical Z value=

How can I get a critical Z value from here?

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Operation Management, Management Studies

Category:- Operation Management
Reference No.:- M91874986

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