Purchase Solution

Variables, Sample, and Population

Not what you're looking for?

Ask Custom Question

1. A researcher is interested in the effects of humidity on the eating behavior rats. A group of 25 rats is housed in a controlled environment and the researcher measures the amount of food consumed by each rat with humidity set at 20% and again with the humidity set at 80%.
a. Identify the population
b. Identify the sample

2. Define the terms population, sample, parameter, and statistic. Explain the relationships among the terms

3. Statistical methods are classified into two major categories: descriptive and inferential. Describe the general purpose for the statistical methods in each category.

4. Define the concept of sampling error. Be sure that your definition includes the concepts of statistic and parameter.

16. Define and differentiate between a discrete variable and a continuous variable

17. A researcher studying the effects of environment on mood asks participation to sit alone in a waiting room for 15 minutes at the beginning of an experiment. Half of them are assigned to a room with dark blue walls, and the other half are assigned to a room with bright yellow walls. After 15 minutes in the waiting room, each participant is brought into the lab and given a mood-assessment questionnaire. The score on the mood questionnaire are then examined.
a. Identify the independent and dependent variables for this study
b. What scale of measurement is used for the independent variable?

18. For the following scores, find the value of each expression:
X= 5,2,1,4,
a. Sigma X , X=
b. Sigma X²
c. Sigma X)²
d. Sigma (X-1)
See attached file for full problem description.

Attachments
Purchase this Solution
Solution Summary

Answers questions on Population, sample, parameter, statistic, discrete variable and a continuous variable, independent and dependent variables, scale of measurement.

Purchase this Solution
Free BrainMass Quizzes
Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

Know Your Statistical Concepts

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.

Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

View More Free Quizzes
Related BrainMass Solutions

  • How to explain the influences on z-scores

    374797 Influences on Z-Scores How to explain the influences on z-scores with constant variables in hypothesis tests with (1) increasing differences between the sample mean and the original population mean, (2) increasing the population standard deviation

  • Testing regression coefficients

    But since measuring the entire population is either not practical or too expensive, we collect a sample from the population and from that sample we calculate a sample statistic and use it to estimate the population parameter.

  • Cost-Benefit Analysis

    Descriptive measures for a sample 2. summary measures for the population 3. pre-determined variables 4. endogenous variables summary measures for the population: Collection and interpretation of quantitative data.

  • Scientific Methodology

    What is the difference between population and sample? When would you want to use a sample? How would you go able obtaining a sample? What is the difference between probability and non-probability sampling?

  • Degree of Freedom Information

    Consider the statistic used to test , where µ is the mean of a population, is the sample mean and s is the sample standard deviation of a sample of size n taken from this population.

  • Interpretation of Correlation coefficient

    The estimate of population correlation is the sample correlation and confidence interval provides the interval in which we would find the population mean.

  • Auditing: attribute sampling or variables sampling

    The population size affects the sample size (Variable or Attribute) ___ 2. Sampling risks include the risk of incorrect acceptance and risk of incorrect rejection. ___ 3. The population variability affects the sample size. ___ 4.

  • Random Sample and correlation

    141232 Random Sample and correlation A sample of 20 countries has been randomly selected. Attached is a chart indicating the literacy rate, population, and GDP for each country. Compute the correlation among the variables.

  • InteliBoard Assessment

    d. are selected from the sample population as the other sample e. none of the above 11.

  • Generalizability of research findings

    They may not easily be studied in natural setting and with confounding variables, the actual characteristics may be far different in general population than those that may be found for the selected sample for a study.

View More Related Solutions