Measuring Usability: Quantitative Usability, Statistics and Six-Sigma

Pages

The following pages have the tag t-statistic associated with them. The number of users that have also tagged the page ' t-statistic ' is in parenthesis.

Task Times in Formative Usability Tests ( 4 )
Time-on-task can be used as a valuable diagnosis and comparative tool during formative evaluations.

Questions

The following questions have the tag t-statistic associated with them. The number of users that have also tagged the question ' t-statistic ' is in parenthesis.

Your company asks you to compare a new advertising campaign and the old one. Sample data on the acco. . . ( 127 )

Calculate a 98% confidence interval for the following data 15.7,15.7,15.5,15.2,15.2,15.1,15.3.. . . ( 3 )

Calculate the 95% confidence interval on the following GPA's from 30 randomly selected students. 0.. . . ( 3 )

An engineer in an automotive factory wishes to know what the tire pressure is on all cars leaving th. . . ( 3 )

A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighed on a ver. . . ( 4 )

An engineer in an automotive factory wishes to know what the tire pressure is on all cars leaving th. . . ( 3 )

A random sample of 100 pumpkins is obtained and the mean circumference is found to be 40.5 cm. Assum. . . ( 3 )

A cereal company claims that the mean weight of the cereal in its packets is 14 ounces. The weights . . . ( 3 )

What is the advantage of a t-score over a z-score?. . . ( 3 )

What is the formula for finding the t-statistic. . . ( 3 )

Various temperature measurements are recorded at different times for a particular city. The mean of . . . ( 3 )

A random sample of 25 households finds that an average of 2.3 people reside in each house (the stand. . . ( 4 )

You are interested in whether men participate more than women in political activities, so you survey. . . ( 3 )

Will the t statistics calculated from 4 observations valid?. . . ( 3 )