Share the steps in manual calculation (No internet and website ). If possible show me in excel format

Statistical Inference -Hypothesis testing

Question 1)Is the body temperature of teenagers higher than the normal human body temperature of 98.4 degrees? A random sample of 25 teenagers show an average temperature of 98.8 degrees, with a standard deviation of 0.5 degrees. Is the original claim true?

Question 2)Suppose a production line operates with a mean filling weight of 16 ounces per container. Since over-or under-filling can be dangerous, a quality control inspector samples 30 items to determine whether or not the filling weight has to be adjusted. The sample revealed a mean of 16.32 ounces. From past data, the standard deviation is known to be .8 ounces. Is the filling process is in control?

Question 3)An insurance company is reviewing its current policy rates. When originally setting the rates they believed that the average claim amount was $1,800. They are concerned that the true mean is actually higher than this, because they could potentially lose a lot of money. They randomly select 40 claims, andcalculate a sample mean of $1,950. Assuming that the standard deviation of claims is $500, test to see if the insurance company should be concerned.