Mathematics, 05.07.2020 05:01 xjsg
An experiment is conducted with 15 seniors who are taking Spanish at Oak View High School. A randomly selected group of eight students is first tested with a written test and a day later with an oral exam. To avoid order effects, the other seven students are tested in reverse order. The instructor is interested in the difference in grades between the two testing methods. The table below contains the descriptive statistics for the grades of the two tests.
n Mean Std. Deviation
Talk 15 1.523 1.530
Write 15 4.166 2.047
Difference (Talk - Write) 15 -2.643 2.182
Calculate a 98% confidence interval for the difference in mean grades between the two testing methods.
Answers: 2
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