Confidence Interval for Proportion: Defective dolls
Not what you're looking for?
A shipment of 500 dolls is received by Panda Importers. The quality control manager selects a random sample of 75 to test. Five are bound to be defective. Construct a 90 percent confidence interval for the population proportion of defective dolls in the shipment.
Ans should be
0.06666 + / - 1.645 sqrt (0.667 (1-0.667 / 75) sqrt (500-75 / 500 - 1)
How do I get these numbers?
Would it be reasonable to find 10 defective dolls?
Purchase this Solution
Solution Summary
The solution provides step by step method for the calculation of confidence interval for population proportion. Formula for the calculation and Interpretations of the results are also included. An interactive excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data. The expert examines confidence intervals for proportions defective dolls.
Solution Preview
Please see the attachments.
Answer
90% Confidence Interval for proportion is given by
where p = x/n = 5/75 = 0.0667
Confidence Interval Estimate for the Mean
Data
Sample Size 75
Number of Successes 5
Confidence Level 90%
...
Purchase this Solution
Free BrainMass Quizzes
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.
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.