Purchase Solution

Estimate and Sample Sizes

Not what you're looking for?

Ask Custom Question

I. In a study designed to test the effectiveness of acupuncture for treating migraine headaches 36 subjects were treated with acupuncture and 25 subjects were given a sham treatment. The number of migraine attacks for the acupuncture group had a mean of 2.609 and a sample deviation of 1.8.

Construct a 95% confidence interval for the mean number of migraine attacks for those subjects treated with acupuncture. You may use StatCrunch for making calculations.

a. What is the point estimate for the mean number of migraine attacks for those subjects treated with acupuncture?
b. What is the appropriate distribution (z or t)?
c. Show equation with filled in numerical values.
d. What is the Confidence Interval?

Purchase this Solution
Solution Summary

The expert examines estimates and sample sizes. The appropriate distributions are examined.

Solution Preview

Problem: In a study designed to test the effectiveness of acupuncture for treating migraine headaches 36 subjects were treated with acupuncture and 25 subjects were given a sham treatment. The number of migraine attacks for the acupuncture group had a mean of 2.609 and a sample deviation of 1.8. ...

Solution provided by:
Anwesha Ghosh, MSc
Education
  • MSc, Osmania University
  • MSc, Indian Institute of Technology - Roorkee (I.I.T.-ROORKEE)
  • BSc, Banaras Hindu University
Recent Feedback
  • "Very fast turnaround. Excellent communication! Much appreciated!"
  • "excellent"
  • "excellent"
  • "excellent work"
  • "Fantastic..great solution and very well explained!!!!"
Purchase this Solution
Free BrainMass Quizzes
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.

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

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

View More Free Quizzes
Related BrainMass Solutions

  • Confidence Intervals

    Estimate with 90% confidence the difference between the two population means. b. Repeat part a changing the sample standard deviations to 41 and 15 respectively. c. What happens when the sample standard deviations increase? d.

  • Factors in Sample Size

    Then the minimum sample size should be the same, although the population sizes may be significantly different. The expert examines the factors in sample sizes.

  • Determination of sample size

    As we try to estimate based on sample we have to deal with sampling error and to make our estimation as close as possible we need to sample enough objects from the population.

  • Estimates and sample sizes

    This solution discusses estimates and sample sizes.

  • Population Means and Confidence Intervals

    186573 Population Means and Confidence Intervals 1.What sample size would be needed to estimate he population mean to within one-half standard deviation with 95% confidence?

  • Confidence Intervals

    This solution explains how confidence intervals are affected by different sample sizes.

  • Probability, Expected value, Binomial, Sample Size...

    CONFIDENCE INTERVALS: A sample of 50 Hummer owners revealed that 40 have cut back on their driving due to ... SAMPLE SIZES: A bank wishes to estimate the mean balances owed by their MasterCard customers ...

  • Data Analysis - Finding Sample Sizes for Confidence Intervals

    We want to be 99% confident that the difference between the estimate and the actual value of the population proportion is at most 0.100 in absolute value.

  • Public versus Private Education

    If the two values of s2 were simply averaged as they are in the case of equal sample sizes, then the estimate based on the smaller sample size would count as much as the estimate based on the larger sample size.

View More Related Solutions