Question

665 LA 1C 36 Professor Smith took a sample of 193 students from her morning class and a sample of 140 students from her evening class. On Exam 1, all those sampled 7 from the morning class got a 68 while those sampled from the evening class averaged a 71 with a variance of 146. If Professor Smith combines these two

Answer 1

As HOMEWORKLIB answering guideline I have answered only the question 1

I have used minitab to get the answer

For qusetion 1A i have used the steps as follows

1. Enter the data,name it x
2. Stat-Basic statistics-Display descriptive statistics
3. 
4. Statistics
5. click on interquartile range
6. ok
7. ok

output

Hence the answer is 0.006

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1B

I have used excel to get the answer

Steps

1. Enter the data in seprate column,
2. In an empty cell ,type "=COVARIANCE.S(array1,array2)"   
3. then press Enter
4. the output will shown as this

Hence the required covariance is

-0.00023

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1C

Steps in excel

1. Enter the data in separate column
2. In an empty cell ,type "=CORREL(array1,array2)"
3. Press Enter
4. the output will be shown

Hence the correlation is

-0.53901

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