Question

Last year a company received 50 complaints concerning carpet installation. The data in the accompanying table represents the number of days between the receipt of a complaint and the resolution of the complaint. Complete parts (a) through (d).

55 55 7 31 136 31 30 151 2 119

77 76 22 15 10 128 107 111 19 85

91 40 31 30 10 15 6 162 33 37

25 29 22 5 11 10 15 18 10 12

22 58 40 26 33 25 26 24 32 66

The supervisor claims that the mean number of days between the receipt of a complaint and the resolution of the complaint is days. At the level of significance, is there evidence that the claim is not true (that is, that the mean number of days is different from 20)?

State the null and alternative hypotheses.

Determine the test statistic.

Find the p-value.

State the conclusion.

b. What assumption about the population distribution is needed in order to conduct the t test in (a)?

Construct a normal probability plot to evaluate the assumption made in (b). Choose the correct graph below.

Answer #1

1. One of the major measures of the quality of service
provided by an organization is the speed with which the
organization responds to customer complaints. A large family-held
department store selling furniture and flooring, including carpet,
had undergone a major expansion in the past several years. In
particular, the flooring department had expanded from 2
installation crews to an installation supervisor, a measurer, and
15 installation crews. A business objective of the company was to
reduce the time between...

Your IT department provided you data on patients that received
ER services, their GHHS, and their recovery time. Prepare a report
to share with the owners of the facility that will help you make
informed decisions about how long you can expect a patients’
recovery time would be based on their GHHS. Based on your findings
provide recommendations on your plan moving forward to improve the
functioning of your facilities in generating revenue. Prepare a
report that addresses each of...

The data in the accompanying table represent the number of corn
plants in randomly sampled rows (a 17-foot by 5-inch strip) for
various types of plots. An agricultural researcher wants to know
whether the mean numbers of plants for each plot type are equal.
Complete parts (a) through (e) below. (a) Write the null and
alternative hypotheses. b) State Requirements of a One-Way ANOVA
Test c) P-Value?
Sludge Plot
Spring Disk
No Till
25
34
31
27
29
26
34...

Write the null and alternative hypothesis for a two-tailed test
for each of the following variables: (10 points)
Student Ht Wt Age (Yrs) Shoe Size Waist Size Pocket
Change
01 64 180 39 07 36 018
02 66 140 31 09 30 125
03 69 130 31 09 25 151
04 63 125 36 07 25 011
05 68 155 24 08 31 151
06 62 129 42 06 32 214
07 63 173 30 08 34 138
08 60...

Person
number
X
Value
Y
Value
Person number
X
Value
Y
Value
Person number
X
Value
Y
Value
1
24
30
11
39
42
21
21
27
2
42
53
12
60
65
22
33
29
3
20
27
13
34
40
23
25
27
4
31
30
14
24
26
24
22
25
5
22
24
15
51
57
25
28
33
6
46
47
16
80
83
26
34
40
7
52
60
17
28
27
27
53...

Data Set
Height
Weight
Age
Shoe Size
Waist Size
Pocket Change
64
180
39
7
36
18
66
140
31
9
30
125
69
130
31
9
25
151
63
125
36
7
25
11
68
155
24
8
31
151
62
129
42
6
32
214
63
173
30
8
34
138
60
102
26
6
25
67
66
180
33
8
30
285
66
130
31
9
30
50
63
125
32
8
26
32
68
145
33...

The accompanying data table lists measured voltage amounts
supplied directly to a family's home. The power supply company
states that it has a target power supply of 120 volts. Using those
home voltage amounts, test the claim that the mean is 120 volts.
Use a 0.01 significance level.
Day 1 Volts 124.2
2 123.9
3 123.9
4 124.3
5 123.4
6 123.3
7 123.3
8 123.6
9 123.5
10 123.7
11 123.5
12 123.7
13 123.8
14 123.7
15 123.9...

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...

Weather Tracker
Day of Month
Highest Temp
Weather Type
1
72
Sunny
2
67
Rain
3
62
Cloudy
4
42
Cloudy
5
40
Sunny
6
55
Rain
7
52
Cloudy
8
48
Rain
9
42
Sunny
10
44
Rain
11
52
Cloudy
12
57
Sunny
13
63
Sunny
14
65
Rain
15
74
Sunny
16
75
Sunny
17
55
Sunny
18
52
Rain
19
48
Cloudy
20
44
Rain
21
47
Sunny
22
45
Sunny
23
55
Cloudy
24
58...

13. Refer to the data set in the accompanying table. Assume that
the paired sample data is a simple random sample and the
differences have a distribution that is approximately normal. Use a
significance level of 0.10 to test for a difference between the
number of words spoken in a day by each member of 30 different
couples.
Couple Male Female
1
12320 11172
2
2410 1134
3
16390 9702
4
9550 9198
5
11360 10248
6
9450 3024
7 ...

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