Question

You believe the population of difference scores is normally distributed, but you do not know the standard deviation. You obtain pre-test and post-test samples for n = 50 subjects. The average difference (post - pre) is ¯ d = 7.3 with a standard deviation of the differences of s d = 28.7 .What is the test statistic for this sample? (Report answer accurate to three decimal places.)test statistic =______________-What is the p-value for this sample? (Report answer accurate to four decimal places.)

Answer 1

Answer:

test stat=1.7986

p value =0.0391

Step-by-step explanation:

given

n=50

d = 7.3

s d = 28.7

formula to calculate test statistic

t=$\frac{d}{\frac{s d}{\sqrt{n} } }$

⇒ t=$\frac{7.3}{\frac{28.7}{\sqrt{50} } }$

⇒t=1.7986

for 49 df and t=1.7986  ,p value can be obtained from software

p value=0.0391