B. Norma wants to know the common number of children her classmates' families have. Which of thefollowing samples is a good representation of the class? Why?1.A sample consisting of Norma's friends2.A sample consisting of students belonging to rich families.3. A sample consisting of students whose names were drawn from a box all the names of students inNorma's class.This is an idea of representativeness which leads to the importance of random sampling, a method ofdrawing out a sample from a population without a definite plan, purpose, or pattern.

Option 3 is correct A sample consisting of students whose names were drawn from a box all the names…

Answered: B. Norma wants to know the common…

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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In selecting a sample, if you were to obtain a systematic sample of 40 from a population of 600, and your randomly selected starting point is 12, your next three selections should be: a. 24, 36, 48 b. 27, 42, 57 c. 42,92, 137 d. 90, 140, 190
The question is in the attachment
2. State the type of sample being collected. The quality control officer at a manufacturing plant needs to determine what percentage of items in a batch are defective. The officer chooses every 15th batch off the line and counts the number of defective items in each chosen batch
4. If you have sample sizes of 22 and 15, and the data is pooled, what is the degrees of freedom? Group of answer choices 37 14 21 35
12. The simple random sample of the ages of the children entering a carnival yields the following results: ages 5, 7, 8, and 9 years old. A sample size of 3 are drawn form this. a. How many possible sample size of 2 are drawn from the population? b. List all the possible samples of size 3 can be drawn from the population, and make a sampling distribution of the sample means. c. Find the mean, variance, and standard deviation of the sampling distribution of the sample means.
1. Suppose the proportion of American adults who work at home is 40%. For a random sample of 100 American adults, what is the distribution of the sample proportion?
2. In a population it is estimated that 20% have a desired trait of interest for the researcher. The researcher wants to know how many people on average he has to draw from a population to get 2 people with the trait. Use rows 20-24 of the Random Number Table to carry out the simulation. Explain clearly how you set up the problem and report your findings. Answer:
Which of the following are sources of sampling error and which are sources of nonsampling error? The subject cannot be contacted in five calls. The telephone directory is used as a sampling frame. Data are gathered by asking people to go to a website and answer questions online. A typing error is made in recording the data. The subject lies about past illegal drug use. Interviewers choose people on the street to interview.
In Problems 9-12, conduct each test at the a= 0.05 level of significance by determining (a) the null and alternative hypotheses, (b) the test statistic, (c) the critical value, and (d) the P-value. Assume that the samples were obtained independently using simple random sampling.
1. A scientist is studying the effect of exercise on blood pressure. He studies 50 people who exercise regularly to find out whether their blood pressures are low, average, or high. This is an example of a(n): Answer choices: sample survey. observational study. experiment.
I have a group with 6 members from my family.I've weight 52 kg,my father weight 63 kg,my younger brother weight 35 kg,my cousin weight 38 kg,my uncle weight 72 kg. and my eldest brother weight 55 kg.Consider samples of size 4 that can be drawin from this population. To Do: Draw the histogram for the sampling distribution of the sample means.
To collect data about the number of students in your high school who have a part time job, which of the following methods is most likely to lead to a sample that is the most representative of the students in your school? Interview all the girls in the school. Ask the principal. Interview all the students in 9th grade. Assign each student in the school a number and randomly select students to be interviewed. Interview all the students who are on the sports teams in the school.

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