Purchase Solution

Statistics - Inference of a Population Mean

Not what you're looking for?

Ask Custom Question

Calcium and blood pressure. In a randomized comparative experiment on the effect of calcium in the diet on blood pressure, researchers divided 54 healthy white males at random into two groups. One group received calcium; the other, a placebo. At the beginning of the study, the researchers measured many variables on the subjects. The paper reporting the study gives the mean = 114.9 and s = 9.3 for the seated systolic blood pressure of the 27 members of the placebo group.
a. Give a 95% confidence interval for the mean blood pressure in the population from which the subjects were recruited.
b. What conditions for the population and the study design are required by the procedure you used in (a)? Which of these conditions are important for the validity of the procedure in this case?
Checking my work and understanding of application

Purchase this Solution
Solution Summary

A Complete, Neat and Step-by-step Solution is provided.

Solution Preview

Degrees of freedom = n - 1 = 27 - 1 = 26

t- score for 95% confidence is t = 2.1314

(a) Lower limit of the 95% confidence ...

Purchase this Solution
Free BrainMass Quizzes
Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

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.

Measures of Central Tendency

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

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

  • Multiple choice questions on statistics

    Which of the following is not an element of descriptive statistical problems? a. An inference made about the population based on the sample. b. The population or sample of interest. c.

  • Sampling methods, inferential statistics and coverage error

    Statistics about the actual population rather than the target population C. Probability sampling D. Inability to perform inferential statistics 4) Which of the following is not a characteristic of an ideal statistician? A.

  • Statistics - Inference about a population mean

    276062 Statistics - Inference about a population mean The placebo effect. The placebo effect is particularly strong in patients with Parkinson's disease.

  • Population & Sample Size Questions

    80095 Population & Sample Size Questions 1.Why would you use a small sample to draw inference about a large population? Test of a single proportion: 2.

  • Central Limit Theorem of Mean

    Answer : When sampling is from a normal population, the means of samples are normally distributed. When sampling is from an unknown or nor-normal population, size of sample plays a crucial role.

  • T - Statistic vs. Z-Statistic

    References: Neil A. Weiss (2003) Introductory Statistics Addison Wesley M.G. Bulmer (1997) Principles of Statistics Dover Publications Larry Wasserman (2004) All of Statistics: A Concise Course in Statistical Inference Springer Richard J.

  • Statistical inference

    Develop a 95% confidence interval estimate of the mean assets, mean 7-day yield, and mean 30-day yield for the population of money market funds. Provide a managerial interpretation of each interval estimate.

  • Define: Population, sample, parameter, statistic, inference

    a) Population b) Sample c) Parameter d) Statistic e) Statistical inference a. Population: Population is the complete set of individuals, groups, objects, or events of interest in a study. b.

  • What do confidence intervals represent?

    Hi there, Here are your answers: In a statistical context, laws of large numbers imply that the average of a random sample from a large population is likely to be close to the mean of the whole population.

  • Confidence interval

    The purpose of statistics is to make inferences about a population based on information contained in a sample.

View More Related Solutions