Confidence interval
Not what you're looking for?
A toy manufacturer wants to see how long, on average, a new toy captures children's attention. He tests 14 children selected at random and finds that their mean attention span is 23 minutes with a standard deviation of 7 minutes. If we assume that attention spans are normally distributed, find a 99% confidence interval for the mean attention span of children playing with this new toy. Then complete the table below.
Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.
a. what is the lower limit of the interval?
b. what is the upper limit of the interval ?
Purchase this Solution
Solution Summary
This solution gives the step by step method for computing confidence interval for mean.
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.
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.
Terms and Definitions for Statistics
This quiz covers basic terms and definitions of statistics.