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(CORRECT ANSWER) MATH225N Week 3 Assignment : Standard Deviation

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1.Question 

Find the sample variance of the following set of data:
11, 4, 4, 6, 10.

  • Round the final answer to one decimal place.

Ans:

2.Question

Using the following set of data (the same as in the previous problem), find the sample standard deviation:
11, 4, 4, 6, 10.

  • Round the final answer to one decimal place.

3.Question

Which of the following lists of data has the largest standard deviation

18, 17, 15, 17, 18, 19, 18, 17, 19, 17

27, 25, 25, 24, 31, 23, 29, 22, 32, 26

16, 12, 16, 15, 14, 13, 14, 15, 12, 14

17, 19, 17, 17, 16, 15, 16, 18, 19, 17

13, 17, 15, 13, 13, 13, 15, 15, 13, 13

4.Question

Which of the following lists of data has the largest standard deviation?

Select the correct answer below:

22, 25, 25, 22, 25, 23, 24, 23, 26, 24

13, 11, 11, 11, 10, 14, 14, 10, 11, 11

16, 14, 15, 15, 16, 16, 15, 16, 18, 14

25, 23, 25, 22, 21, 25, 22, 21, 25, 23

7, 14, 19, 18, 4, 16, 5, 11, 11, 12

5.Question

The following dataset represents the salaries for all six employees at a small start-up company.

Find the mean, variance, and standard deviation for this dataset of salaries (expressed in thousands of dollars):

55, 59, 63, 67, 71, 75

(Round your answers to one decimal place)

Select the correct answer below:

Correct answer:

Mean = , Standard Deviation = , Variance =

6.Question

A company is interested to know the variation in yearly sales amount for all 5 salespeople in the company.

The dataset shown below is the sales amount sold by the 5 salespeople in the company (expressed in thousands of dollars):

40,60,65,70,80

Find the variance for this dataset.

Provide your answer below:

Answer=

7.Question

A large company is interested to know the variation in yearly sales for its salespeople. The dataset shown below is the yearly sales for a sample of 5 salespeople (expressed in thousands of dollars):

40, 60, 65, 70, 80

Find the variance for this dataset.

  • Round the final answer to the nearest whole number.

Answer:

8.Question

Which of the data sets represented by the following histograms has the smallest standard deviation?

Select the correct answer below:

Answer:

9.Question

Which of the data sets represented by the following histograms has the smallest standard deviation?

 Select the correct answer below:

30, 21, 19, 17, 16, 32, 26, 25, 19, 16

5, 11, 15, 7, 5, 9, 8, 16, 14, 11

25, 24, 28, 18, 32, 34, 34, 22, 28, 19

17, 19, 17, 18, 17, 16, 16, 16, 17, 20

9, 16, 14, 22, 20, 9, 19, 16, 21, 8

 10.Question

Which of the data sets represented by the following histograms has the smallest standard deviation?

 Select the correct answer below:

11.Question

Which of the following lists of data has the largest standard deviation?

Select the correct answer below:

9, 11, 13, 10, 13, 13, 13, 9, 9, 10

24, 15, 21, 23, 9, 22, 12, 21, 20, 13

15, 18, 18, 18, 18, 15, 15, 15, 16, 16

23, 24, 23, 24, 26, 25, 26, 23, 26, 24

10, 12, 13, 11, 11, 14, 14, 11, 12, 12

12.Question

The following data values represent the daily amount spent by a family during a 7 day summer vacation.

Find the population standard deviation of this dataset:

$96, $125, $80, $110, $75, $100, $121

Answer:

13.Question

The following data values represent the daily amount spent by a family during a 7 day summer vacation.

Find the sample standard deviation of this dataset:

$96, $125, $80, $110, $75, $100, $121

  • Round the final answer to one decimal place.

Answer:

14.Question

The data below are the monthly average high temperatures for November, December, January, and February in New York City from the Country Studies/Area Handbook Series sponsored by the U.S. Department of the Army between 1986 and 1998. What is the sample standard deviation?

54,42,40,40

  • Round the final answer to one decimal place.

Select the correct answer below:

6.7

3

45.3

136

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