15. Which of the following is a valid sampling method? Selection of the first 25 people encoun-tered. Selection of participants using procedures that depend on probability. Interviewing randomly selected persons from among those who respond to an e-mail survey. Selection of participants based on the demographics of the population. Selection of students for a locker search based on hairstyles. 16. Which best describes statistical bias? Bias is the tendency for a distribution to be skewed. Bias is not an issue with symmetric mound-shaped distributions. Bias increases variation in responses. Bias is a systematic error in the survey results. Bias only pertains to gender and ethnicity issues. 17. A probability distribution of earnings from a $1,000 investment in an Internet company for a term of 3 years is -1,000.13 .15 1,000 .24 2,000 .35 3,000 .13 How much should you expect to earn from this 3-year investment? (A) $800 (B)$1,000 (C) $1,200 (D) $2,000 (E) $2,200 18. In an observational study of performance improvement resulting from the completion of an SAT preparation course, the investigator believes that gender is related to student per-formance. Which of the following designs would address her concern? (A) a completely randomized design, sinceeveryone in the population of interest would have an equal chance of selection random sample stratified for gender randomized design blocked for gender completely randomized design of males only systematic sample of females

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Related questions

Question

15. Which of the following is a valid sampling method?

Selection of the first 25 people encoun-tered.
Selection of participants using procedures that depend on probability.
Interviewing randomly selected persons from among those who respond to an e-mail survey.
Selection of participants based on the demographics of the population.
Selection of students for a locker search based on hairstyles.

16. Which best describes statistical bias?

Bias is the tendency for a distribution to be skewed.
Bias is not an issue with symmetric mound-shaped distributions.
Bias increases variation in responses.
Bias is a systematic error in the survey results.
Bias only pertains to gender and ethnicity issues.

17. A probability distribution of earnings from a $1,000 investment in an Internet company for a term of 3 years is

-1,000
.13

.15

1,000

.24

2,000

.35

3,000

.13

How much should you expect to earn from this

3-year investment?

(A) $800

(B)$1,000

(D) $2,000

(E) $2,200

18. In an observational study of performance improvement resulting from the completion of an SAT preparation course, the investigator believes that gender is related to student per-formance. Which of the following designs would address her concern?

(A) a completely randomized design, since
everyone in the population of interest would have an equal chance of selection