PROBLEM SET # 9 Direction: Read each problem carefully and solve following the steps of hypothesis testing. 1. It is known from the records of the city schools that the standard deviation of math test...

pls answer number 1

Extracted text: PROBLEM SET # 9 Direction: Read each problem carefully and solve following the steps of hypothesis testing. 1. It is known from the records of the city schools that the standard deviation of math test on the XYZ test is 5. A sample of 200 pupils from the system was taken and it was found out that the sample mean score is 75. Previous test showed the population mean to be 70. Is it safe to conclude that the sample is significantly different from the population?