Q:Question:A credit score is used by credit agencies (such as mortgage companies and banks) to assess the creditworthiness of individuals. Values range from 300 to 850, with a credit score over 700 considered to be a quality credit risk. According to a survey, the mean credit score is 704.8. A credit analyst wondered whether high-income individuals had higher credit scores. He obtained a random sample of 43 high-income individuals and found the sample mean credit score to be 716.2 with a Standard deviation of 80.4. Conduct the appropriate test to determine if the high income individuals have higher credit scores at the a= 0.05 level of significance.A:Answer:Answer: Given, Ho : u = 704.8 Ha : u > 704.8 test ...