It is known from the records of the city schools that the standard deviation of mathematics test scores on problem-solving is 5. Previous test showed the population mean to be 70. A sample of 200 bright students was taken and it was found out that the sample mean score is 75. It is safe to conclude at 0.025 level of significance that the sample is significantly different from the population.

a. Null Hypothesis:

b. Alternative Hypothesis:

c. Critical Value =

d. Test Value =

e. Accept (A) or Reject (R)? :