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A certain test preparation course is designed to help students improve their scores on the LSAT exam. A mock exam is given at the beginning and end of the course to determine the effectiveness of the course. The following measurements are the net change in 6 students' scores on the exam after completing the course: 6,16,19,12,15,14 Using these data, construct a 90% confidence interval for the average net change in a student's score after completing the course. Assume the population is approximately normal. Step 1 of 4 : Calculate the sample mean for the given sample data. Round your answer to one decimal place.

Respuesta :

Answer:

Step-by-step explanation:

given that a certain  test preparation course is designed to help students improve their scores on the LSAT exam. A mock exam is given at the beginning and end of the course to determine the effectiveness of the course. The following measurements are the net change in 6 students' scores on the exam after completing the course:

We find

Mean 13.66666667  = 13.7

Standard Error 1.801234145

Margin of error for 90% = 1.645*std error = 2.963

Confidence interval = Mean ±Margin of error

=(10.704, 16.630)

Sample mean = 13.7

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