Introductory Statistics (10th Edition)
10th Edition
ISBN: 9780321989178
Author: Neil A. Weiss
Publisher: PEARSON
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Textbook Question
Chapter 7.2, Problem 55E
For Exercises 7.55–7.57, refer to Equations (7.1) and (7.2) on pages 315 and 316, respectively.
7.55 Suppose that a simple random sample is taken without replacement from a finite population of size N.
- a. Show mathematically that Equations (7.1) and (7.2) are identical for
samples of size 1. - b. Explain in words why part (a) is true.
- c. Without doing any computations, determine σx for samples of size N without replacement. Explain your reasoning.
- d. Use Equation (7.1) to verify your answer in part (c).
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Suppose that a simple random sample is taken without replacement from a finite population of size N.
a. Show mathematically that Equations (7.1) and (7.2) are identical for samples of size 1.
b. Explain in words why part (a) is true.
c. Without doing any computations, determine σ x for samples of size N without replacement. Explain your reasoning.
d. Use Equation (7.1) to verify your answer in part (c).
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11 10:27 am
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revision wk ch 6A.pdf
Grade 8- Math
V International School Lahore
(Chapter:6)
Revision worksheet 6A
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The Reviews editor for a certain scientific journal decides whether the review for anyparticular book should be short (1–2 pages), medium (3–4 pages), or long (5–6 pages).Data on recent reviews indicates that 60% of them are short, 30% are medium, and theother 10% are long. Reviews are submitted in either Word or LaTeX. For short reviews,80% are in Word, whereas 50% of medium reviews are in Word and 30% of long reviewsare in Word. Suppose a recent review is randomly selected. (a) What is the probability that the selected review was submitted in Word format? (b) If the selected review was submitted in Word format, what are the probabilities ofit being short, medium and long? (You need to find three probabilities)
Chapter 7 Solutions
Introductory Statistics (10th Edition)
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