Drug Companies and Research Studies. Use this information for Exercises 73–75. The Annals of Internal Medicine reported that 39 of the 40 research studies with acknowledged sponsorship by a drug company had outcomes favoring the drug under investigation.20

Question 8.252

image 75. Refer to Exercise 74. What if we decrease the confidence level to 90%, while changing nothing else? Explain precisely what would happen to the following statistics and why:

  2. Margin of error
  3. Width of the confidence interval

8.3.75

(a) Decrease in from 1.96 to 1.645. (b) Decrease in the margin of error from 0.0748 to 0.0628. (c) Decrease in the width of the confidence interval from 0.1496 to 0.1256.