Suppose researchers wish to determine if the mean birth weight of infants in 1961 is significantly lower than the historical average, 121121 ounces. Suppose the population standard deviation of birth weights is equal to 1919 ounces. Use software to calculate the sample mean (?⎯⎯⎯x¯) for these data. Then, conduct a one‑sample ?z‑test to test the researchers' hypothesis at the ?=0.05α=0.05 level. What are the standard error (SE), the ?z‑statistic, and the ?z‑critical value for this test? Please round all answers to the nearest three decimal places. Sample mean 119.81.

Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015
1st Edition
ISBN:9781680331141
Author:HOUGHTON MIFFLIN HARCOURT
Publisher:HOUGHTON MIFFLIN HARCOURT
Chapter11: Data Analysis And Displays
Section: Chapter Questions
Problem 3CT
Topic Video
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Suppose researchers wish to determine if the mean birth weight of infants in 1961 is significantly lower than the historical average, 121121 ounces. Suppose the population standard deviation of birth weights is equal to 1919 ounces.

Use software to calculate the sample mean (?⎯⎯⎯x¯) for these data. Then, conduct a one‑sample ?z‑test to test the researchers' hypothesis at the ?=0.05α=0.05 level. What are the standard error (SE), the ?z‑statistic, and the ?z‑critical value for this test? Please round all answers to the nearest three decimal places.

Sample mean 119.81.

 

SE:
Incorrect
z-statistic:
Incorrect
z-critical value:
Incorrect
Transcribed Image Text:SE: Incorrect z-statistic: Incorrect z-critical value: Incorrect
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