Tags
Tag: Margin of Error
Pages
The following pages have the tag
Margin of Error associated with them. The number of users that have also tagged the page ' Margin of Error ' is in parenthesis.
Margins of Error in Usability Tests ( 102 )
The 20/20 Rule of PrecisionHow many users will complete the task and how long will it take them? If you need to benchmark an interface, then a summative usability test is one way to answer these questions. Summative tests are the gold-standard for usability measurement. But just how precise are the metrics?
Graph and Calculator for Confidence Intervals for Task Times ( 49 )
Visualizing your task time data is an essential step in understanding its distribution and computing accurate confidence intervals. This calculator creates a dot-plot of your task times, transforms the raw data to adjust for non-normality and computes the intervals.
Questions
The following questions have the tag
Margin of Error associated with them. The number of users that have also tagged the question ' Margin of Error ' is in parenthesis.
An automobile manufacturer wants to estimate the mean gasoline mileage that its customers will obtai. . . ( 1 )
Find the margin or error for the 95% confidence interval used to estimate the population proportion.. . . ( 4 )
When estimating the mean of a population, how large must the sample be in order that the 95% error m. . . ( 4 )
A researcher expects the population proportion of the Cubs Fans in Chicago to be 80%. Error of less . . . ( 4 )
In a national wide survey a researcher expects 30 percent of the population will agree with an value. . . ( 4 )
Suppose you are planning a sample of employees to determine the monthly average # of vacation days. . . . ( 4 )
Calculate a 98% confidence interval for the following data 15.7,15.7,15.5,15.2,15.2,15.1,15.3.. . . ( 4 )
Calculate the 95% confidence interval on the following GPA's from 30 randomly selected students.
0.. . . ( 4 )
A central university has a student population of 60,000. The university is interested in determining. . . ( 4 )
A central university has a student population of 60,000. The university is interested in determining. . . ( 4 )
A researcher is interested in estimating the average salary of fire fighters in a large city. He wan. . . ( 3 )
Based on information obtained from a sample of 54, a 98% confidence interval for the average profit . . . ( 3 )
Can you give me a formula to calculate sample size?. . . ( 4 )
A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighed on very . . . ( 4 )
A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pag. . . ( 4 )
Popcorn kernels take between 100 and 200 seconds to pop. What sample size (number of kernels) would . . . ( 4 )
My question is really about sample size. Say you work at a facility and want to perform an assessme. . . ( 4 )
Determine the critical value Za/2 that corresponds to 94% level of confidence
Compute the 90% con. . . ( 4 )
How would I figure out a 90% and 95% confidence interval for the below informaion? What would be th. . . ( 5 )
Annual starting salaries for college graduates with degrees in business administration are generally. . . ( 3 )
A random sample of 25 households finds that an average of 2.3 people reside in each house (the stand. . . ( 5 )
How do you determine the sample size for data for which the mean and standard deviation are not know. . . ( 4 )
