Question
In: Statistics and Probability
In a study of Americans from a variety of professions were asked if they considered themselves...
In a study of Americans from a variety of professions were asked if they considered themselves left-handed, right-handed, or ambidextrous.
The results are given below:
|
Profession Right Left Ambidextrous Total |
|
Psychiatrist 101 10 7 118 |
|
Architect 115 26 7 148 |
|
Orthopedic Surgeon 121 5 6 132 |
|
Lawyer 83 16 6 105 |
|
Dentist 116 10 6 132 |
|
Total 536 67 32 635 |
1. Test for an association between handedness and career for these five professions. What do you conclude at the 5% significance level? What do you conclude at the 1% confidence level? Make sure you show all the steps.
2. Can we conclude, at the 5% significance level, that left-handedness is equally distributed among the five professions? Make sure you show all the steps.
Solutions
orchestra answered 1 year agoRelated Solutions
In a study of Americans from a variety of professions were asked if they considered themselves...
In a study of Americans from a variety of professions were asked
if they considered themselves left-handed, right-handed, or
ambidextrous. The results are given below:
Profession
right
left
ambidextrous
total
Teacher
101
10
7
118
Engineer
115
26
7
148
Surgeon
121
5
6
132
Firefighter
83
16
6
105
Police Officer
116
10
6
132
Total
536
67
32
635
Is there enough evidence to conclude that proportion of
left-handed surgeons is less than the proportion of left-handed
Engineers?...
3. In a survey, 1200 adult Americans were asked, "Are you a total abstainer from, or...
3. In a survey, 1200 adult Americans were asked, "Are you a
total abstainer from, or do you on occasion consume, alcoholic
beverages?" Of the 1200 adults surveyed, 470 indicated that they
were total abstainers. In a recent survey, the same question was
asked of 1200 adult Americans and 400 indicated that they were
total abstainers. Has the proportion of adult Americans who totally
abstain from alcohol changed? Use the α=0.1 level of
significance.
How did African Americans use the war to advance themselves, politically, socially, and culturally? What were...
How did African Americans use the war to advance themselves,
politically, socially, and culturally? What were the results of
their efforts?
During a study, individuals were asked to rate a product on a scale of 1-5. From...
During a study, individuals were asked to rate a product
on a scale of 1-5. From the following data, help the researcher
determine whether any significant differences exist in opinions
among individuals from two different regions. (Note: Assume a
significance level of 0.05 and assume that the population standard
deviation is unknown). Show your work.
Texas
New York
3
2
4
1
5
4
2
2
4
3
5
2
4
3
2
Students in a school were asked to participate in a study of the effects of a...
Students in a school were asked to participate in a study of the
effects of a new teaching method on reading skills of 10th graders.
To determine the effectiveness of the new method, a reading test
was given to each student before applying the new method
(pre-test). Another test was given to the same students after
applying the new method (post-test). Experts consider that a good
measure of improvement is given by the following formula:
Improvement=20(Post-test score)- 10(Pre-test score). That...
In a marketing study, 100 consumers were asked to select the best digital music player from...
In a marketing study, 100 consumers were asked to select the
best digital music player from the iPod, the iRiver, and the Magic
Start MP3. To summarize the consumer responses with a frequency
table, how many classes would the frequency table have?
In a study of speed dating, male subjects were asked to rate the attractiveness of their...
In a study of speed dating, male subjects were asked to rate
the attractiveness of their female dates, and a sample of the
results is listed below (1equalsnot attractive; 10equalsextremely
attractive). Construct a confidence interval using a 90%
confidence level. What do the results tell about the mean
attractiveness ratings of the population of all adult females? 5,
9, 3, 8, 5, 4, 7, 7, 9, 10, 6, 9 What is the confidence
interval for the population mean mu? less...
In a study of speed dating, male subjects were asked to rate the attractiveness of their...
In a study of speed dating, male subjects were asked to rate
the attractiveness of their female dates, and a sample of the
results is listed below
(1=not attractive; 10=extremely attractive). Construct a
confidence interval using a 99% confidence level. What do the
results tell about the mean attractiveness ratings of the
population of all adult females?
7,7,3,9,6,5,7,9,8,9,4,9
What is the confidence interval for the population mean μ?
____< μ <____
(Round to one decimal place as needed.)
In a study of speed dating, male subjects were asked to rate the attractiveness of their...
In a study of speed dating, male subjects were asked to rate
the attractiveness of their female dates, and a sample of the
results is listed below (1 equals =not attractive; 10 equals
=extremely attractive). Construct a confidence interval using a
99% confidence level. What do the results tell about the mean
attractiveness ratings of the population of all adult
females?
6, 8, 2, 9, 7, 6, 7, 7, 9, 10, 5, 9
What is the confidence interval for the...
In a study of speed dating, male subjects were asked to rate the attractiveness of their...
In a study of speed dating, male subjects were asked to rate
the attractiveness of their female dates, and a sample of the
results is listed below (1equalsnot attractive; 10equalsextremely
attractive). Construct a confidence interval using a 95%
confidence level. What do the results tell about the mean
attractiveness ratings of the population of all adult females?
7, 8, 1, 8, 6, 5, 6, 7, 7, 10, 3, 8
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