Purchase Solution

Confidence interval for a mean

Not what you're looking for?

Ask Custom Question

Cotinine Levels of Smokers When people smoke, the nicotine they absorb is converted to cotinine, which can be measured. A sample of 40 smokers has a mean cotinine level of 172.5. Assume that the population standard deviation is known to be 119.5, find a 90% confidence interval estimate of the mean cotinine level of all smokers. What aspect of this problem is not realistic?

Purchase this Solution
Solution Summary

This solution finds and interprets a confidence interval for the mean cotinine level of smokers.

Purchase this Solution
Free BrainMass Quizzes
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.

Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

View More Free Quizzes
Related BrainMass Solutions

  • Confidence interval

    . ** Please see the attached file for the complete solution response ** Details A. 95 % Confidence Interval , sample size 30 Confidence Interval Estimate for the Mean Data Sample Standard Deviation 12 Sample Mean 82 Sample Size 30 Confidence

  • Confidence interval for mean

    Assume that this average is based on a sample 755 students and that the population standard deviation for weekly accommodation costs is $ 11. The confidence interval for population mean is given by Tune a.

  • Confidence Interval for Mean: Baseball Data

    confidence interval for the mean number f errors committed by each team C) Develop a 9 percent confidence interval for the mean number of stolen bases for each team.

  • Manager's sample of 25 delivery trucks. Confidence interval

    A 95% confidence interval for the mean cost is constructed and found to be $253 to $320. He reasons that this interval contains the mean operating cost for the fleet of delivery trucks since the sample mean is contained in the interval. a.

  • The Solution to Confidence Interval for Mean

    156886 The Solution to Confidence Interval for Mean A sample of the math test scores of 35 fourth-graders has a mean of 82 with a standard deviation of 15. Find the 95% confidence interval of the mean math test scores of all fourth-graders.

  • Confidence interval for mean

    Compute and explain a 95% confidence interval estimate of the unknown population mean starting salary for Accounting graduates.

  • Statistics and Confidence Intervals Deviations

    Compute a 95% confidence interval for the mean IQ of students attending that college.

  • Confidence Intervals and Population Means

    522740 Confidence Intervals and Population Means Construct a 95% confidence interval to estimate the population mean with a sample mean = 110 and ?

  • Confidence interval for mean

    184969 Computing Confidence Interval for Mean Suppose a sample of 50 is taken from a population with a standard deviation of 27 and that the sample mean is 86. Establish a 95.5% interval estimate for the population mean.

  • Understanding confidence intervals

    Following example clearly illustrates the meaning of confidence interval for a population mean.

View More Related Solutions