Based on a sample of 40 people, the sample mean GPA was 2.15 with a standard deviation of 0.04 The test statistic is: (to 2 decimals) The p-value is: (to 2 decimals) Based on this we:

A group of students take a exam and the adverage was m = 90 and the standard deviation was 7.8. Answer the questions using  raw scores, z scores and creating a curve. what percentage of the population lands between the raw scores of 86 and 105?

Records on a fleet of trucks reveal that the average life of a set of spark plugs is normally distributed with a mean of 22,100 miles. The fleet owner purchased 18 sets and found that the sample average life was 23,400 miles; the sample standard deviation was 1,412 miles. To decide if the sample data support the company records that the spark plugs average is LESS THAN 22,100 miles, state your decision in terms of the 6 steps. Use a 0.025 level of significance. 1, define h0 and h1 2. define Alpha 3. which Test, T or Z? 4. decision role, with the picture if necessary. 5. calculate sample test and reach your decision, reject h0 or fail to reject h0 6. conclusion based on the problem.

A large chemistry course took their final exam. The mean was 75 with a standard deviation of 8. What proportion of people scores in the A range (90 or above)?