Quiz week 4

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Old Dominion University *

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Statistics

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Jan 9, 2024

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n which of the following scenarios does the central limit theorem most likely hold true? a. Researchers are interested in approximating the national average BMI (kg/m2) by surveying 158 participants and requiring that they weigh in and have height measurements taken. b. Researchers are interested in approximating the national average BMI (kg/m2) by surveying 24 participants and requiring that they weigh in and have height measurements taken. c. Researchers are interested in approximating the national average BMI (kg/m2) by surveying 37 participants and requiring that they weigh in and have height measurements taken. d. Researchers are interested in approximating the national average BMI (kg/m2) by surveying 19 participants and requiring that they weigh in and have height measurements taken. Question 2 0.67 / 0.67 pts Researchers are interested in conducted an analysis about the effectiveness of a new investigational drug aimed at increasing overall survival among HIV positive patients co-infected with Hepatitis C. Current national data claims that 5 year survival for patients with HIV and Hepatitis C is 32%. This study contains a _____? a. parameter b. estimator c. forecast
d. interpolation Question 3 0.67 / 0.67 pts After treatment analysis, the research team estimates that 5 year survival among those treated with the new medication is 37%. This study reports a _______? a. parameter b. estimator c. forecast d. interpolation Question 4 0.67 / 0.67 pts What happens to the standard error of an estimate when the sample size in a SRS decreases? a. The standard error gets smaller b. The precision of the estimate increases c. The standard error stays roughly the same
d. The precision of the estimate decreases Question 5 0.67 / 0.67 pts Which of the following requisites for a Z test are unnecessary in formal testing of significance? a. A SRS or reasonable approximation thereof b. A population large enough to approximate normality via the Central Limit Theorem c. A known σ prior to initiation of testing d. A set level for power of a test Question 6 0.67 / 0.67 pts Which of the following statistics is not necessary to know prior to performing a power calculation for a one-sample z test? a. The detectable difference worth measuring b. The false positive rate of the test c. The population standard deviation
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