A researcher collected data on the annual salary of doctors in Illinois.He wishes to construct a confidence interval for the mean annual salary. Which of the following are true?   I.  A 98% confidence interval will have a greater chance of including the true mean salary than a 95% confidence interval. II.  A 98% confidence interval will be narrower than a 95% confidence interval. III.  A 98% confidence interval requires the researcher to take a larger sample. Choose the best answer below:   A, II, III B. I C. III D. I, II E. II

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