Which of the following is/are true? a) scientists typically study samples because they are especially interested inthemb) scientists typically study populations because they are usually quite smallc) scientists typically study samples because they are too lazy to collect population datad) scientists typically study samples because collecting entire populations is usually not feasiblee) scientists often use statistics on samples to estimate parameters on populationsf) statistical inference is the process of inferring about populations based on knowledge of samplesg) if we had complete access to population data, then computing such things as means and medians would never have to be doneh) t-tests, z-tests, ANOVA, regression, are all statistical procedures that help us make inferences about populations based on sample datai) b, d, e, fj) d, e, f, hk) all except c

Answered: Which of the following is/are true?…

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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Which of the following is/are true?

a) scientists typically study samples because they are especially interested inthem
b) scientists typically study populations because they are usually quite small
c) scientists typically study samples because they are too lazy to collect population data
d) scientists typically study samples because collecting entire populations is usually not feasible
e) scientists often use statistics on samples to estimate parameters on populations
f) statistical inference is the process of inferring about populations based on knowledge of samples
g) if we had complete access to population data, then computing such things as means and medians would never have to be done
h) t-tests, z-tests, ANOVA, regression, are all statistical procedures that help us make inferences about populations based on sample data
i) b, d, e, f
j) d, e, f, h
k) all except c

Definition Definition Middle value of a data set. The median divides a data set into two halves, and it also called the 50th percentile. The median is much less affected by outliers and skewed data than the mean. If the number of elements in a dataset is odd, then the middlemost element of the data arranged in ascending or descending order is the median. If the number of elements in the dataset is even, the average of the two central elements of the arranged data is the median of the set. For example, if a dataset has five items—12, 13, 21, 27, 31—the median is the third item in ascending order, or 21. If a dataset has six items—12, 13, 21, 27, 31, 33—the median is the average of the third (21) and fourth (27) items. It is calculated as follows: (21 + 27) / 2 = 24.

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