Homework Answers
If both sample size and confidance level increases then width of confidence interval may increase decrease or stay same.
from the Ti-84 output
a) 95%confidence interval for true mean order size is
(25104 , 48703)
b)confidence interval can be narrower by increasing the sample size or decreasing the confidence coefficient
feom the above output
a) the 90% confidence interval for the proportion of depositors who asked for cash is
(0.40977., 0.66)
b) yes p is normally distributed becouse both np and nq greater than 5
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