Question

Determine the sample variance and standard deviation for this small dataset:

5

6

8

Include 2 decimal places in your answer (i.e, 4.35)

Answer #1

x |
(x-x̅ ) |
(x - x̅)² |

5 |
-1.33333 |
1.777778 |

6 |
-0.33333 |
0.111111 |

8 |
1.666667 |
2.777778 |

19 |
4.666667 |

Mean = ∑x/n =19/3 =6.3333333

Sample standard deviation = √(∑(x - x̅)²/n-1)
=√(4.666667/3-1)
=1.527525 **=1.53**

Sample variance = ∑(x -
x̅)²/n-1
=4.666667/3-1
=2.333333 =**2.33**

Find the sample variance and standard deviation. 18, 16, 6,
8, 10 Choose the correct answer below. Fill in the answer box to
complete your choice

3.2 question 6
Find the sample variance and the standard deviation for the
following sample. Round the answers to at least two decimal places
as needed. 15 31 23 19 14 37 The sample variance is ___?
The sample standard deviation is___?

In each of the following cases, find the mean, variance, and
standard deviation of the sampling distribution of the sample
proportion .
(a) p = .5, n = 259 (Round variance to 6 decimal places and
standard deviation to 4 decimal places. Do not round intermediate
values.)
(b)
p = .2, n = 124 (Round variance to 6
decimal places and standard deviation to 4 decimal places. Do not
round intermediate values.)
(c)
p = .8, n = 388
(Round...

Find the sample variance and standard deviation. 21 16 5 8
12

The standard deviation of a dataset was 6. However, it was later
found that this dataset contained 2 outliers. So, they were
removed, the standard deviation was calculated again as s. Which of
the following is true?
(a) s < 6
(b) s > 6
(c) s = 6
(d) Not enough information

Compute the (sample) variance and standard deviation of the data
sample. (Round your answers to two decimal places.)
−1, 7, 7, 5, 12
variance
22
standard deviation
?

find the sample variance, standard deviation, and range of the
data.
7, 5, 9, 7, 2, 4, 3, 2, 3, 8

Consider the following.
n = 8
measurements: 4, 3, 7, 7, 5, 5, 4, 6
Calculate the sample variance, s2, using the
definition formula. (Round your answer to four decimal places.)
s2 =
Calculate the sample variance, s2 using the
computing formula. (Round your answer to four decimal places.)
s2 =
Find the sample standard deviation, s. (Round your
answer to three decimal places.)
s =

A sample of 22 items provides a sample standard deviation of
6.
(a)
Compute the 90% confidence interval estimate of the population
variance. (Round your answers to two decimal places.)
________ to _________
(b)
Compute the 95% confidence interval estimate of the population
variance. (Round your answers to two decimal places.)
________ to _______
(c)
Compute the 95% confidence interval estimate of the population
standard deviation. (Round your answers to one decimal place.)
________ to _________

This data is from a sample. Calculate the mean,
standard deviation, and variance.
This data is from a sample. Calculate the mean,
standard deviation, and variance.
x
20.5
45.3
10.6
31.8
28.4
30.6
49.8
32.2
27.3
Please show the following answers to 2 decimal
places.
Sample Mean =
Sample Standard Deviation =
Sample Variance = (Please use the standard deviation
above for your calculation.)
Ooops - now you discover that the data was actually from a
population! So now you must...

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