To investigate how people communicate over the internet, a researcher had subjects write messages in an online forum. She split her sample of 76 participants into young adults and older adults based on their age. She then compared how many emojis and emoticons the young adults used in their messages compared to the older adults. What is the best test to analyze the results of this study?

A study looks at the average wait times (minutes) in hospital Emergency Rooms before and after a training programming for staff. Below is the data that was collected (note: N/A means data is missing because the hospital failed to report it).   ER Wait Times (in mins) Pre-Training Post-Training Hospital 1 15 14 Hospital 2 10 11 Hospital 3 27 26 Hospital 4 43 28 Hospital 5 37 27 Hospital 6 17 15 Hospital 7 28 N/A Hospital 8 12 15 Hospital 9 19 11 Hospital 10 N/A 30   What are the degrees of freedom for this test?

You are ready for vacation.

What are your degrees of freedom for this data set?

A study looks at several companies’ profits before and after the introduction of a environmentally friendly initiative. Below is the data that was collected (note: N/A means data is missing because the company failed to report it).   Profit of Companies (in millions of dollars) Pre-Initiative Post-Initiative Company 1 12.7 13.2 Company 2 10.4 12.5 Company 3 9.5 8.5 Company 4 N/A 8.4 Company 5 8.6 8.9 Company 6 N/A 10.7 Company 7 6.9 6.5 Company 8 7.7 9.9 Company 9 10.1 9.8 Company 10 11.8 12.1 Company 11 12.2 14.5 Company 12 8.9 9.7   What are the degrees of Freedom for this test?

The t test for independent means is used when each group is tested ____________.

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How many subjects were examined in the following t test:  t(45) = 2.01, p < 0.05?

Calculations You will need to return to this page to use the table & the find the equations.   Formulas you will need: Independent Samples T-Test:

High school attendance study A high school conducts an experiment to test if there is a difference between the number of times their students are absent in the fall compared to the winter months.   You have data for the following 5 students:   Data STUDENT FALL WINTER 1 1 2 2 2 3 3 1 3 4 2 2 5 1 1   What do you conclude about this school’s absences? (Assume standard