How does a t test differ from a z test in terms of when it is used, how it is calculated, and how we determine significance?
What will be an ideal response?
A t test differs from a z test in that s is not needed to make the calculations and the sample size should be smaller (30 or lower), whereas for a z test s is known and the samples are 30 or greater. The calculations are similar except that with a t test they are based on using s (the estimated standard deviation) rather than s. The z test has set critical values to determine significance and the critical values for the t test vary based on sample size.
You might also like to view...
Which type of baby is most likely to die or have permanent disabilities?
a) preterm b) full term c) midterm d) small-for-date
Under pressure to meet a deadline, a truck driver has just gone three days without sleep. In the last twelve hours, he has begun to experience sensations of movement in stationary objects. He apparently has
a. damaged the retinas of his eyes due to eye strain. b. undergone a change in muscle tension affection his kinesthetic sense. c. reached the first stages of temporary sleep-deprivation psychosis. d. upset the vestibular system through excessive exposure to road vibration.