Question

You have tested to find whether a relationship exists between hours of sleep the night before an exam and grade on the exam, You have a participant pool of n 30, df = 28. more hours of sleep receive higher grades on the exam. This is a directional hypothesis, so you run a one-tailed test, with o 0.05. You run the numbers and find a correlation of 0.243. The critical value from the t-table is Your hypothesis is that a significant relationship will exist, where those with a) 2.048 b) 1.701 c) 1.697 d) 2.042

Answer 1

This is right tailed test and with alpha=0.05

t critical value is given by, 1.701

Answer 2

You have tested to find whether a relationship exists between hours of sleep the night before an exam and grade on the exam.  You have a participant pool of n = 28, df = 26.  Your hypothesis is that a significant relationship will exist, where those with more hours of sleep receive higher grades on the exam.  This is a directional hypothesis, so you run a one-tailed test, with α = 0.05.  You run the numbers and find a correlation of 0.243.  Doing the math, you find t = 1.278.  The critical value needed is ____________ and you conclude that your correlation is ________