739 A scientist conducted a t test using 005 and e arrived a

7.3.9 A scientist conducted a t test using 0.05 and e arrived at a P-value of 0.03, which led him to reject Ho 1 = 2. However, he made a mistake in his calcula- tions; the correct P-value is 0.23. True or false (and say why): When the scientist rejected Ho he clearly made a lype l error.

Solution

Answer: True

Type I error is the false rejection of the null hypothesis when it is true.

Actual P value of 0.23 means that there is actually no significant difference between the two group means.

When he concluded that P=0.03 means, he rejects the true null hypothesis. He made a Type I error.