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Levart [38]
3 years ago
9

A certain test preparation course is designed to help students improve their scores on the LSAT exam. A mock exam is given at th

e 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.
Mathematics
1 answer:
Natalija [7]3 years ago
6 0

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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Sutopa has 3/4 of the money Maneet has. Maneet has $18 less than Kim. Together, they have $286.40. How much money does each of t
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Solving a system of equations we can see:

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<h3>How much money each of them has?</h3>

First, let's define the variables:

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  • M = money that Maneet has.
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We can write the system of equations:

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First, we can rewrite the second equation to get:

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Now we can replace the first and second equations into the third one:

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