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u also need to look up the appropriate z value for a 90% confidence interval, which is, 1.65 for 90%. These z values are available from a number of resources.
Where n is the sample size, m is the mean, s is the standard deviation.
Can you do the rest?
I am getting (146.7082,153.2917)
(I'd like to get a second opinion on this, as I have just started statistics, and I had never seen a Venn diagram before last month. I'll ask my stats teacher tomorrow when I'm in if you like, or maybe a more advanced member can tell me if I've got this right).
In a random sample of 60 refrigerators, the mean repair cost was $150 and the standard deviation was $15.50. Construct a 90% confidence interval for the population mean repair cost.
Given P(A)=0.47,P(B)=0.37 , and P(A and B)=0.15 , draw a Venn diagram, fill in the probabilities associated with the various regions, and thus determine: