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what is the critical value and z value ?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section: Chapter Questions

Problem 8CR

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Question

A medical researcher wishes to see if hospital patients in a large hospital have the same blood type distribution as
those in the general population. The distribution for the general population is as follows: type A, 20%; type B, 28%; type O,
26%; and type AB =26%. He selects a random sample of 50 patients and finds the following: 10 have type A blood, 10 have type
B, 23 have type O, and 7 have type AB blood.
alo
At a =0.05, can it be concluded that the distribution is the same as that of the general population? Use the critical value method
with tables.
what is the critical value and z value ?

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