Question

**6) [True or False] Standard deviation can be
negative.**

A) TRUE

B) FALSE

**7. A random sample of 40 college professors is selected
from all professors at a university.
The following list contains their ages.
65, 45, 44, 38, 55, 55, 49, 42, 43, 22, 52, 58, 52, 38,
56, 34, 53, 36, 50, 36
34,
68, 43, 56, 37, 35, 28, 30, 26, 26, 53, 30, 37, 55,
28, 39, 26, 31, 37, 50**

Z score for 55 is?

Answer #1

6) The minimium value of standard deviation can be 0 as it does
not given any diection sense in its value. It only gives us an
absolute measure of spread. **Therefore the given statement
is False here.**

7) For the given set of values, the sample mean is computed first here as:

Using this the sample standard deviation here is computed as:

Therefore the z score for x = 55 score is computed here as:

19)
3) A test is administered annually. The test has a mean
score of 150 and a standard deviation of 20. If Ravi’s z-score is
1.50, what was his score on the test?
A) 180
B) 130
C) 30
D) 150
E) None of the above
87)A random sample of 40 college professors is selected
from all professors at a university. The following list contains
their ages. 65, 45, 44, 38, 55, 55, 49, 42, 43, 22, 52,
58, 52,...

2a. Describe the sample and population you are studying.
I am studying customers' satisfaction level with their
car insurance plan.
2b. Calculate the sample mean and sample standard deviation for
your variable. Keep at least four decimal places.
2c. Calculate the standard error and the margin of error for a 90%
confidence interval. Keep at least four decimal places.
Data:
36
18
66
43
28
39
47
40
24
46
48
57
36
58
39
62
43
65
74
36...

Using the data set (link below), please calculate a one-way
chi-square tests for President Trump approval rating for the first
years in office. Specifically run chi-square on the "Approving"
column.
This is the information provided.
Approving
Disapproving
Unsure/NoData
39
55
6
37
57
6
35
60
5
36
59
5
35
59
6
37
56
7
38
57
5
38
56
6
38
58
4
35
60
5
36
58
6
37
57
6
38
56
6
37
58
5...

The Whitcomb Company manufactures a metal ring for industrial
engines that usually weighs about 50 ounces. A random sample of 50
of these metal rings produced the following wights (in ounces).
51
53
56
50
44
47
53
53
42
57
46
55
41
44
52
56
50
57
44
46
41
52
69
53
57
51
54
63
42
47
47
52
53
46
36
58
51
38
49
50
62
39
44
55
43
52
43
42
57...

Q1. A clinical trial is run to assess the effects of
different forms of regular exercise on HDL levels in persons
between the ages of 18 and 29. Participants in the study are
randomly assigned to one of three exercise groups - Weight
training, Aerobic exercise, or Stretching/Yoga – and instructed to
follow the program for 8 weeks. Their HDL levels are measured after
8 weeks and are summarized below.
Weight Training
Aerobic Exercise
Stretching/Yoga
48
38
56
49
41...

B. Determine whether or not the table is a valid probability
distribution of a discrete random variable. Explain fully.
X
0.23
0.14
0.17
P(X=x)
-0.22
0.38
0.84
Daily sales of a medium sized restaurant are normally
distributed with a mean of $720 and a standard deviation of
$80.
What is the probability that a randomly selected day will make
a sales of at least $656?
What is the probability that a randomly selected day will make
a sales between $680...

Kuya conducted a study to see if, among smokers, that there is a
significant difference in the sense of smoking urge between
individuals in various levels of administration. To
measure the urge to smoke, the Chronic Habit Obliging Killer
Emphysema (CHOKE) test was used. Type of profession was
categorized to Upper Management, Middle Management, and Lower
Management. The higher the score, the stronger the
urge. Is there a significant difference in their
urge?
UPPER
MIDDLE
LOWER
44
47
31
45
48
32
50
43...

The answers are provided. Please provide an
explanation/machanism to support the answers. Questions 1, 3, 13,
14, 19, 21, 25, 27, 30, 32, 33, 34, 37, 38, 39, 42, 43, 44, 45, 46,
47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 61, 62, 63 and 65.
(I know it's a lot, but please do as many as you are willing to.
Thank you! Here is the link to the document:
http://www.kau.edu.sa/Files/0008904/files/41686_g.pdf

6. A simple random sample of 31 cans of generic soda had their
caffeine levels measured, in milligrams per 12 ounce serving. The
data is given below. Find the 99% confidence interval estimate of
the mean amount of caffeine in the entire population of this
generic soda.
34 35 35 36 36 36 38 38 38 38 38 39 40
40 41 42 43 43 45 45 46 46 47 50 50 51
52 53 55 56 60

For each of the data sets provided below, calculate the mean,
median, mode, and standard deviation.
1) Data Set 1:
23, 26, 50, 39, 55, 64, 50, 10, 42, 35, 51, 42, 43, 56, 64, 48,
48, 57, 27, 37
2) Data Set 2:
26, 31, 10, 37, 38, 35, 30, 24, 26, 27, 24, 32, 32, 19, 34, 33,
14, 32, 24, 39, 30

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