# Statistics, Confidence Interval Estimation, Mean and Standard Deviation

Not what you're looking for?

Confidence Interval Estimation

1. Compute a 95% confidence interval for the population mean, based on the sample 1, 2, 3, 4, 5, 6, and 30. Change the number from 30 to 10 and recalculate the confidence interval. Using the results, describe the effect of an outlier or extreme value on the confidence interval.

7.285714 mean

10.16061 std.dev

The 95% confidence since interval for true mean is

7.3 ± 2.447*10.16/sqrt(7)

7.3 ± 9.4 = (-2.1; 16.7)

4.428571 mean

2.992053 std.dev

The 95% confidence since interval for true mean is

4.4 ± 2.447*2.99/sqrt(7)

4.4 ± 2.8 = (1.6; 7.2)

As we see from the results, the extreme value make the confidence interval wider since due to this outlier the variation among data becomes larger comparing with the variation without that value.

##### Purchase this Solution

##### Solution Summary

Statistics, Confidence Interval Estimation, Mean and Standard Deviation are investigated. The solution is detailed and well presented.

##### Solution Preview

Please see the attached file for the complete solution.

Thanks for using BrainMass.

Mathematics, Other Year 4 Statistics check

I am totally lost in this Statistics class, and I just want to make sure that I did this correctly and that this answer is somewhat close to the correct answer.

Confidence Interval Estimation

1. Compute a 95% confidence interval for the population mean, based ...

##### 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.

##### Measures of Central Tendency

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

##### Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.