Sample 60 customers
sample mean purchase was $10.75
sample standard deviation was $3.1.
i) Find values from t distribution related with the 95% confidence interval?
ii) Find evidence that population mean purchase amount is different from $10 at 95% confidence level?
iii) Find evidence that population mean purchase amount is greater than $10 at 95% conÖdence level?
iv) Compute p-value for the test in (ii).
v) Compute p-value for the test in (iv)