Question

# Sales volume last weekend for a sample of ten car dealerships were as follows: Data Point...

Sales volume last weekend for a sample of ten car dealerships were as follows:

 Data Point # Sales 1 2 3 4 5 6 7 8 9 10 21 10 19 35 23 34 44 29 15 30

What is the variance of the sample data?

Please round your answer to the nearest tenth.

Note that the correct answer will be evaluated based on the full-precision result you would obtain using Excel.

#### Homework Answers

Answer #1

Solution :

We have a sample of size n = 10 .

To find the variance of this sample , we construct a table using Excel.

 x x2 21 441 10 100 19 361 35 1225 23 529 34 1156 44 1936 29 841 15 225 30 900 SUM 260 7714

Sample variance s2 =

= [1/(10 - 1)][7714 - (2602/10) ]

= 106.0

The variance of the given sample data is 106.0

{

We can directly find the sample variance in excel. Use function

= VAR(select data)

}

The variance of the given sample data is 106.0

Know the answer?
Your Answer:

#### Post as a guest

Your Name:

What's your source?

#### Earn Coins

Coins can be redeemed for fabulous gifts.

##### Not the answer you're looking for?
Ask your own homework help question