A medical researcher treats 400 subjects with high cholesterol using a new drug. After two months of taking the drug, the average decrease in cholesterol level is = 90 and the researcher assumes that the decrease in cholesterol follows a Normal distribution, with unknown mean and standard deviation = 20. A 95% confidence interval for is: a. 90 ± 2.35. b. 90 ± 1.96. c. 90 ± 3.92. d. 90 ± 2.94.
A medical researcher treats 400 subjects with high cholesterol using a new drug. After two months of taking the drug, the average decrease in cholesterol level is = 90 and the researcher assumes that the decrease in cholesterol follows a Normal distribution, with unknown mean and standard deviation = 20. A 95% confidence interval for is: a. 90 ± 2.35. b. 90 ± 1.96. c. 90 ± 3.92. d. 90 ± 2.94.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 13PPS
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A medical researcher treats 400 subjects with high cholesterol using a new drug. After two months of taking the drug, the average decrease in cholesterol level is = 90 and the researcher assumes that the decrease in cholesterol follows a
Normal distribution , with unknown mean and standard deviation = 20. A 95% confidence interval for is:a. 90 ± 2.35.b. 90 ± 1.96.c. 90 ± 3.92.d. 90 ± 2.94.-
A veterinarian collects data on the number of times race horses are raced during their careers. The veterinarian finds that the average number of races a horse enters is = 15.3, with a standard deviation of s = 6.8 in a sample of n = 20 horses. A 95% confidence for , the average number of times a horse races, is given by:
a. (11.38, 19.22).b. (12.32, 18.28).c. (12.12, 18.48).d. (10.95, 19.65).
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