Confidence interval and sample size needed
Not what you're looking for?
2.
A company manufactures steel bolts that continuously feed an assembly line downstream. Historically, the thickness of these bolts follows a normal distribution with a standard deviation of 1.6 mm. A recent random sample of 10 observations yielded these values of thickness, in mm:
9.7 9.9 10.3 10.1 10.5
9.4 9.9 10.1 9.7 10.3
a.Construct a 95% confidence interval for the true mean thickness.
b.Find the number of observations, n, required to estimate the true mean thickness to within
±0.2 mm using a 95% confidence interval.
Purchase this Solution
Solution Summary
Calculations of Confidence interval and sample size needed are provided. The solution is detailed and well presented.
Purchase this Solution
Free BrainMass Quizzes
Terms and Definitions for Statistics
This quiz covers basic terms and definitions of statistics.
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.
Measures of Central Tendency
Tests knowledge of the three main measures of central tendency, including some simple calculation questions.