Question

If a class of 40 had an average mean of 82 and a standard deviation of 4. The teacher wanted to compare to the nation with a pop. score of u=73. What would "t" value be, sig. level at .01, and interpretation of results?

Answer 1

Solution :

This is the two tailed test .

The null and alternative hypothesis is ,

H₀ :   = 73

H_a : 73

Test statistic =t

= ( - ) / s / n

= (82 - 73) / 4 / 40

Test statistic = 14.23

df = 39

P-value = 0

= 0.01

P-value <

Reject the null hypothesis .