Based on past data, the sample mean of the credit card purchases at a large department...

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Based on past data, the sample mean of the credit card purchasesat a large department store is $45. Assuming sample size is 25 andthe sample standard deviation is 9.
a) Â Â Â Â Â Â Â Â What % ofsamples are likely to have between 25 and 35?Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â _____
b) Â Â Â Â Â Â Â Between what twovalues 95% of sample meansfall?Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â _
c)Â Â Â Â Â Â Â Â Â Belowwhat value 98% of sample meansfall?Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â _
d)Â Â Â Â Â Â Â Â Above whatvalue only5% of sample meansfall??Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â _____
Within what symmetrical limits of the population percentage will95% of the sample percentages fall?

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SOLUTIONFrom given dataBased on pastdata the sample mean of the credit card purchases at a largedepartment store is 45 Assuming sample size is 25 and the samplestandard deviation is 9Sample size n 25Standard deviation 9Mean 45z x x 45 9a What ofsamples are likely to have between 25 and See Answer

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Based on past data, the sample mean of the credit card purchases at a large department...

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