Question

From a set of n = 30 numbers, you find the sample mean is x = 15.5 and the sample variance is s^2 = 3.1. Suppose you now make an additional measurement and get x = 15.5 (new data). Calculate the new sample variance.

Answer #1

Set A: n = 5; x = 7 Set B: n = 50; x = 7 (a) Suppose the number
12 is included as an additional data value in Set A. Compute x for
the new data set. Hint: x = nx. To compute x for the new data set,
add 12 to x of the original data set and divide by 6. (b) Suppose
the number 12 is included as an additional data value in Set B.
Compute x...

#2. Find the mean, median, and mode for the following sample of
scores:
3, 6, 7, 3, 9, 8, 3, 7, 5
Mean=
Median=
Mode=
#4. Find the mean, median, and mode for the scores in the
following frequency distribution table:
X
F
8
1
7
1
6
2
5
5
4
2
3
2
Mean=
Median=
Mode=
#6. A population of N = 15 scores has SX= 120. What is the
population mean?
#10 One sample has a...

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...

Let x bar be the mean of a random sample of n = 36
currents (in milliamperes) in a strip of wire in which each
measurement has a mean of 16 and a variance of 6. X bar has an
approximate normal distribution, find P(12.5 < x bar < 15.6)
.

Calculate the sample
variance.
Formula:
s2 = ∑(X-mean)2) / (N-1)
Data:
(X)
X-mean
(x - mean
)2
17.5
27
16
17
28
27.5
16.5
16.5
6
26
18.5
20
25
21
27
23
22.5
20.5
25
21
27
27.5

Let S be the set {(-1)^n +1 - (1/n): all n are natural
numbers}.
1. find the infimum and the supremum of S, and prove that these
are indeed the infimum and supremum.
2. find all the boundary points of the set S. Prove that each of
these numbers is a boundary point.
3. Is the set S closed? Compact? give reasons.
4. Complete the sentence: Any nonempty compact set has a....

The following data are from a simple random sample (The
population is infinite):
Sample Size: 166
Sample Mean: 15.5
Population Variance: 138
If the Analysis was run as a two tailed test find the Margin of
error ± using an alpha value =0.10 (Input the absolute value for
the margin of error (that is if the answer is ± 3.1, input 3.1) ,
Use 2 decimals in your answer) Use the appropriate table.

The following is a set of data from a sample of n equals 5 n=5.
10,2,1,6,3 a. Compute the mean, median, and mode. b. Compute
the range, variance, standard deviation, and coefficient of
variation. c. Compute the Z scores. Are there any outliers? d.
Describe the shape of the data set.

Question 1:
The following information is obtained from a sample data
set.
n = 20 , ∑x = 130 , ∑y = 960 ,
∑x y = 4908 , ∑x 2 = 882
Find the estimated regression line.
y ^ = Enter you answer to the field 1 in accordance
to the question statement + ( Enter you answer to the field 2 in
accordance to the question statement ) x
Question 2:
A sample data set produced the following...

A set of sample scores from an experiment has an N = 28 and a
mean = 52. H 1 is directional, predicting an effect of the
independent variable which decreases the magnitude of the dependent
variable. H 0 asserts the sample is a random sample from a
population of scores where µ = 55 and s = 12. a = 0.051 tail. Using
the z test to analyze the data, z crit = _________.
PLEASE EXPLAIN HOW YOU GOT...

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