Purchase Solution

Confidence Intervals & T-tests

Not what you're looking for?

Ask Custom Question

Using the attached Excel file, calculate both a confidence interval for a mean (do not worry about the rounding) and a 1-sample t-test that the mean age is less than 62.

What is found? What is the CI and can we reject or accept the null or alternative hypotheses?

Attachments
Purchase this Solution
Solution Summary

The solution gives detailed steps on building the confidence interval and performing a one-sample t test for the given data using excel.

Solution Preview

For the confidence interval for a mean, we first calculate the mean and standard deviation. I do this in ...

Purchase this Solution
Free BrainMass Quizzes
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.

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

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

  • Significance Tests and Confidence Intervals

    The following is a list of acceptable tests: regression line and equation; correlation one-sample t-test one-sample t confidence interval matched-pairs t-test two-sample t-test two-sample t confidence interval F-test for variances ANOVA one-sample

  • Inference for Distributions

    It is common for boys to have somewhat higher scores on standardized tests. It that true? b). Compute 95% T intervals of the Girls' IQ's and the Boys' IQ's and explain what these intervals mean. c).

  • Hypothesis Testing: t-test for a population mean

    Please note that if you want to use this sheet for other single sample t-tests, you can do so. It will do hypothesis tests for any of the three alternatives and one and two tailed confidence intervals for samples requiring a one sample t-tests.

  • Test the breaking strength of a sample of wood fibers

    The standard deviation is the square root of the variance so the range of the standard deviation at 95% confidence is 9.05 to 17.381 The expert tests the breaking strength of a sample of wood fibers. The 99% t-intervals are constructed.

  • One-Sample Hypothesis Test Confidence Intervals

    106139 One-Sample Hypothesis Test Confidence Intervals One-Sample Hypothesis Test Confidence Intervals Take a random sample and perform a t-test against a population mean (no time series for any parts of this project.)

  • Parametric Statistics and Confidence Intervals

    Create 95% confidence intervals for all 10 variables. c. Perform 5 t-tests on the data. On which of the variables was C1 different than C2? Interpret the data and write an executive summary to C1 management describing your findings.

  • Using Statistical Significance Tests

    Based on a comparison of the 95 percent confidence intervals, the null hypothesis should be rejected. Explain how you know. Compare the two 95% confidence intervals found earlier.

  • Hypothesis Tests & Confidence Intervals

    Hypothesis Tests & Confidence Intervals

  • Confidence Intervals for mean; t test; hypothesis test for proportion

    The expert determines the confidence intervals for mean, t tests and hypothesis tests for proportions.

View More Related Solutions