T tests and Z tests

D Question 22 3 pt 22. General Thornburg thinks that his 1513 marine recruits are the best he has ever seen. To test this he compares his recruits' physical endurance scores with the national average. What t test or z test should you use to analyze this data? O t test for single samples O z test for single samples O t test for independent samples O t test for correlated samples D Question 23 3 pts 23. Dr. Johannas believes that ginko can help memory. He gives a group of subjects a memory test without ginko and then a day later gives them the same memory test after taking ginko. What t test or z test should you use to analyze this data? O z test for single samples O t test for independent samples O t test for single samples O t test for correlated samplesD Question 24 3 pts 24. Professor Robinson thinks that her graduating class of 649 students is the best she has ever had. To test this she compares her students' GRE scores with the national average. What t test or z test should you use to analyze this data? O z test for single samples O t test for independent samples O t test for single samples O t test for correlated samples