Exhibit 16.2 A researcher wishes to estimate the average annual expenditures per household on gasoline.The estimate must be accurate within plus or minus $50 and the estimated standard deviation for such expenditures is $400.
Refer to Exhibit 16.2.For a 95%-confidence interval (use z = 2) ,the required sample size is
A) 250.
B) 128.
C) 256.
D) 640.
E) Not enough information given.
Correct Answer:
Verified
Q2: Exhibit 16.3 Stella would like to determine
Q3: If the desired level of confidence to
Q4: Which of the following sampling plans does
Q5: Exhibit 16.3 Stella would like to determine
Q6: Sample size depends upon the
A)type of sample.
B)statistic
Q7: Toppen Olaf Olson,plant manager at the Ridgway
Q8: The size of the sample required to
Q9: Which of the following are required to
Q10: There is a trade-off between the confidence
Q11: The error associated with the estimation of
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