Explore BrainMass
Share

Intro to Stats: review question

This content was STOLEN from BrainMass.com - View the original, and get the already-completed solution here!

It is believed that more than 50% of recovering alcoholics exhibit high levels of depression. A psychological test known as the DACL was given to a random sample of 100 recovering alcoholics, and it was found that 55 had above average depression levels. Does the sample result indicate that the proportion of recovering alcoholics with above average depression levels exceeds 50%? Test the appropriate hypotheses at an alpha = 0.05 level of significance.

Please see attached file.

© BrainMass Inc. brainmass.com October 16, 2018, 8:03 pm ad1c9bdddf
https://brainmass.com/statistics/hypothesis-testing/intro-stats-review-question-136257

Attachments

Solution Preview

For this problem, we will use a one-sided, one-sample z-test. It is a z-test because it involves proportions (as opposed to means, for which we would use a z-test or a t-test, depending on the situation). It is one-sided because we are testing that the sample proportion is above a given number as opposed to not-equal to it. It is one-sample because we are ...

Solution Summary

The expert determines the average depression levels using hypothesis tests.

$2.19
Similar Posting

Relating statistics to solve business related problems

Need guidance on how to approach a statistics paper. Problem: utilize statistics to solve a business related problem. The synopsis should include a discussion of the specific problem, the research methodology used, the quantitative and qualitative tools employed in the study, and the benefit and limitations of the research study. Address additional types of quantitative research recommended to further enhance the validity and reliability of the research findings.

View Full Posting Details