Question

1) Find the sample variance and standard deviation

15 |
36 |
21 |
20 |
17 |
14 |

2)Find the population variance and standard deviation for the following population.

12 4 17 7 24 26

Answer #1

12, 16, 21, 14, 21, 20, 17, 13, 18, 22
Find a 95% CI for the population mean assuming the population
variance is 12.
From your CI above do you think the population mean could be 24?
State Yes or No and why.
Find a 90% CI for the population mean assuming the population
standard deviation is unknown.
From your CI above do you think the population mean could be
18?
State Yes or No and why.
Find a 90%...

Consider the following data:
25
24
18
20
21
18
16
20
23
17
15
13
19
23
24
20
16
26
21
24
15
22
16
12
20
23
19
26
20
25
21
19
21
25
23
26
21
19
20
14
(a)
Develop a frequency distribution
using classes of 12-14, 15-17, 18-20, 21-23, and 24-26.
Class
Frequency
12-14
15-17
18-20
21-23
24-26
Total
(b)
Develop a relative frequency
distribution and a percent frequency distribution using the classes...

Preform the following calculations on the sample below: {10, 10,
20, 15, 10, 14, 17, 17, 12, 11, 13, 12}
a. What is the sample size of the dataset
b. Calculate the mean
c. Find the median
d. Find the mode
e. Calculate the sample variance and sample standard
deviation
f. Find the 35th percentile of the data

Compute the mean, median, range, and mode of the following ten
numbers:
12, 15, 17, 17, 17, 18, 21, 24, 26, 30.
The mean of the five numbers: 14, 18, 20, 30, and x is 19. What
is x?
Compute the sample standard deviation and population standard
deviation of 10, 20, 25, 35, 40. Show all your calculations

Find the population variance and standard deviation for the set
of data: 13, 7, 21, 4, 15, 23, 7,
6.

____________________________________________
The results of a sample of 372 subscribers to Wired
magazine shows the time spent using the Internet during the week.
Previous surveys have revealed that the population standard
deviation is 10.95 hours. The sample data can be found in the Excel
test data file.
What is the probability that another sample of 372 subscribers
spends less than 19.00 hours per week using the Internet?
____________________________________________
Develop a 95% confidence interval for the population mean
____________________________________________
If the editors...

The results of a sample of 372 subscribers
toWiredmagazine shows the time spent using the Internet
during the week. Previous surveys have revealed that the population
standard deviation is 10.95 hours. The sample data can be found in
the Excel test data file.
What is the probability that another sample of 372 subscribers
spends less than 19.00 hours per week using the Internet?
Develop a 95% confidence interval for the population mean
If the editors of Wiredwanted to have the...

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

For the following Simple data ( separately ) :
18 , 30 , 14 , 21 , 25 , 24 , 34 , 15 , 25 , 26 , 18 , 24 , 18 , 33
, 20
1) Find ( Mean , Mode , Median , Range , Midrange , Standard
Deviation , Variance )

Find the mean, variance, and standard deviation from the sample
data.
x f
0-3 42
4-7 84
8-11 55
12-15 83
16-19 112
20-23 24

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