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Question3: Consider the following 12 independent measurements from a normal distribution: Independent measurements: 21, 16, 20,...
Question3: Consider the following 12 independent measurements from a normal distribution:
Independent measurements:
21, 16, 20, 15, 12, 4, 8, 17, 29, 18, 19, 12
1) What is the standard error of the sample mean?
2) Calculate a 90% confidence interval for the population mean.
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Answer #1
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Question3: Consider the following 11 independent measurements from a normal distribution: Independent measurements 17 22 4...
Question3: Consider the following 11 independent
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Independent measurements
17
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18
1) What is the standard error of the sample mean?
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Tries 0/2
2) Calculate a 95% confidence interval for the population
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Thank you!
Consider the following 14 independent measurements from a normal distribution: Independent measurements 11 14 1 18...
Consider the following 14 independent measurements from
a normal distribution:
Independent measurements
11
14
1
18
6
12
10
10
20
19
11
16
15
13
1) What is the standard error of the sample mean?
7.0193
5.1248
1.3697
1.4214
2) Calculate a 99% confidence interval for the population
mean.
[8.9413,16.2016]
[9.2637,15.8791]
[8.4455,16.6973]
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Consider the following data: 25 24 18 20 21 18 16 20 23 17 15 13...
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...
Consider the following data from a random sample: 23 12 26 14 20 25 14 11...
Consider the following data from a random sample: 23 12 26 14 20
25 14 11 21 14 25 21 22 21 8 19 17 22 17 16
a.) Construct a stem-and-leaf plot and specify the five-number
index (min, Q1, Q2, Q3, & max)
b.) Compute the mean and the standard deviation
c.) Find a 95% confidence interval for the population mean.
A random sample of 16 pharmacy customers showed the waiting times below (in minutes). 20, 27,...
A random sample of 16 pharmacy customers showed the waiting
times below (in minutes).
20, 27, 24, 23, 19, 21, 18, 17
22, 15, 18, 32, 16, 20, 19, 19
Find a 90 percent confidence interval for μ, assuming that the
sample is from a normal population. (Round your standard deviation
answer to 4 decimal places and t-value to 3 decimal places. Round
your answers to 3 decimal places.) The 90% confidence interval
_____ to _____
12, 16, 21, 14, 21, 20, 17, 13, 18, 22 Find a 95% CI for the...
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%...
Let the following sample of 8 observations be drawn from a normal population with unknown mean...
Let the following sample of 8 observations be drawn from a
normal population with unknown mean and standard deviation: 28, 23,
18, 15, 16, 5, 21, 13. [You may find it useful to reference
the t table.]
a. Calculate the sample mean and the sample
standard deviation. (Round intermediate calculations to at
least 4 decimal places. Round "Sample mean" to 3 decimal places and
"Sample standard deviation" to 2 decimal places.)
b. Construct the 90% confidence interval for
the population...
Suppose you have selected a random sample of ?=14 measurements from a normal distribution. Compare the...
Suppose you have selected a random sample of ?=14 measurements
from a normal distribution. Compare the standard normal ? values
with the corresponding ? values if you were forming the following
confidence intervals.
(a) 90% confidence interval
z=
t=
(b) 95% confidence interval
z=
t=
(c) 98% confidence interval
?=
t=
2) A confidence interval for a population mean has length
20.
a) Determine the margin of error.
b) If the sample mean is 58.6, obtain the confidence
interval.
Confidence interval: ( ,...
Assuming that the population standard deviation is unknown, calculate the 95% confidence interval of the population...
Assuming that the population standard deviation is
unknown, calculate the 95% confidence interval of the
population mean.
The following is the data. Calculating Process should be shown
by Excel (Formulas). What formulas in statistics are used?
7
21
23
24
18
16
2
19
11
6
3
13
17
9
5
12
13
17
4
14
15
25
12
24
22
14
14
20
15
11
26
17
21
11
4
13
16
14
13
14
25
23
9
15...
Sample data from a normal population are located in the Microsoft Excel Online file below. Use...
Sample data from a normal population are located in the
Microsoft Excel Online file below. Use the data to answer the
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8
12
14
18
19
16
17
3
The point estimate of the population mean is (to 2 decimals)
The standard deviation is (to 2 decimals)
The margin of error is (to 1 decimal)
The 95% confidence interval is (to 1 decimal)
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