Label The Test
A fitness instructor wants to know if average heart rate decreases after a stretching routine.
What is a left-tailed test?
t=0.25, two-tailed test. Is the p-value high or low?
What is high?
Before: 10, After: 7. What is the difference?
What is 3?
What do you compare to alpha to make a conclusion?
What is the p-value?
The p-value is 0.03 and α=0.05. What is the decision?
What is reject the null hypothesis?
A nutritionist tests whether a new supplement increases iron levels.
What is a right-tailed test?
t=1.6, right-tailed test. Is the p-value high or low?
What is moderately high?
Before: 65, After: 72. What is the difference?
What is -7?
What does the p-value represent?
What is probability?
The test statistic is t=−0.45 with a large p-value. Decision?
What is fail to reject the null?
A psychologist wants to know if a stress-reduction program causes any change in anxiety scores.
What is a two-tailed test?
t=−2.4, left-tailed test. Is the p-value high or low?
What is low? (strongly negative t in correct tail)
A participant’s paired scores are (82, 78).
What is 4?
What is the denotion for the mean in a paired difference test?
What is md?
You find p=0.14, significance level 0.10. Decision?
What is fail to reject the null?
A company tests whether a new training method improves typing speed compared to before training.
What is a right-tailed test?
t=2.7, two-tailed test. Is the p-value high or low?
What is low?
Before: 7, After: -2. What is the difference?
What is 9?
What kind of test do we use for paired difference test?
What is a t-test?
t=2.4 with p=0.018 and α=0.01. What is the conclusion?
What is fail to reject?
A researcher investigates whether blood pressure is different after a low-sodium diet.
What is a two-tailed test?
t=1.9, left-tailed test. Is the p-value high or low?
What is high?
Before: 40, After: 65. What is the difference?
What is -15?
What list of values are we concerned with in a paired difference test?
What is the differences between the before and after data sets?
A two-tailed test yields p=0.004 and α=0.01. Decision?
What is reject the null hypothesis?