SOLUTION: 1.The mean number of close friends for the population of people living in the Philippines is 5. The standard deviation of scores in this population is 1.2. An investigator predicts

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Question 1193394: 1.The mean number of close friends for the population of people living in the Philippines is 5. The standard deviation of scores in this population is 1.2. An investigator predicts that the mean number of close friends for intorverts will be significantly different from the mean of the population. The mean number of close friends for a sample of 26 introverts is 6. Find the z-value *
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
z=(x bar-mu)/sigma/ssqrt(n)
=(6-5)/1.2/sqrt(26)=1*sqrt(26)/1.2=4.25