Question
In: Statistics and Probability
1. You want to create an 80% confidence interval for the average age of people who...
1. You want to create an 80% confidence interval for the average age of people who attend football games. You take a sample of 100 attendees and find the average age to be 43.7 years old with a standard deviation of 7 years. Find the value of t* for this confidence interval.
2. You want to make a 90% confidence interval for the difference in the percent of stray cats that are fixed and the percent of cats with homes that are fixed. You take samples from each group. For stray cats you get X1 = 3, n1=20. For cats with homes you get, x2=35, n2=40. You decide to use the Plus Four Method. Fill in the blanks for values below, as you would put them into your formula (or calculator) in order to use the Plus Four Method.
X1 = ___
N1=___
X2=___
n2=___
3. You want to know if people who appear to be a person of color receive higher fines on average for speeding than people who appear to be caucasian. Which tool would be best at answering this question (ex. 2-sampZTest, 2-sampTTEst, etc)?
Solutions
orchestra answered 1 year agoRelated Solutions
You want to create a 95% confidence interval to estimate the proportion of Americans that like...
You want to create a 95% confidence interval to estimate the
proportion of Americans that like beets. What is the minimum sample
size you need to guarantee a margin of error no larger than
.05?
What is an 80% confidence interval? What does it mean for a confidence interval to be...
What is an 80% confidence interval?
What does it mean for a confidence interval to be ‘equal
tailed?’
What are the steps for obtaining a confidence interval?
Find the 80%, 95%, and 99% confidence intervals & margin error Create your own confidence interval...
Find the 80%, 95%, and 99% confidence intervals & margin
error
Create your own confidence interval (you cannot use 80%, 95%,
and 99%) and make sure to show your work. Make sure to list the
margin of error.
122
132
97
102
106
116
94
132
112
123
123
108
84
120
125
123
115
103
127
139
122
124
112
113
109
104
120
109
117
108
125
109
119
138
125
104
110
101
130
124
115
104...
Create your own confidence interval (you cannot use 80%, 95%, and 99%) and make sure to...
Create your own confidence interval (you cannot use 80%, 95%,
and 99%) and make sure to show your work.
using this sample data.
120, 124, 113, 97, 127, 96, 100, 121, 115, 109, 114, 109, 116,
110, 132, 104, 111, 104, 101, 107, 98, 135, 105, 109, 121, 107,
118, 109, 145, 98, 136, 117, 103, 118 126 129 121 105 100 120 107
120 121 99 106 109 127 114 105 102
1.Suppose we want a 99% confidence interval for the average amount spent on books by freshmen...
1.Suppose we want a 99% confidence interval for the average
amount spent on books by freshmen in their first year at college.
The amount spent has a normal distribution with standard deviation
$23.
(a) How large should the sample be if the margin of
error is to be less than $5?
2.
A report in a research journal states that the average weight
loss of people on a certain drug is 3434 lbs with a margin of error
of ±5±5...
In this question, we want to create a confidence interval for mu(m) - mu (u), the...
In this question, we want to create a confidence interval for
mu(m) - mu (u), the difference in average Income between the
genders: Male and Female. You may use the original data for this,
or notice that I’ve included two rows in addition to the Exam1 data
which has the incomes broken down by gender.
a) Check the conditions to construct a confidence interval for
the difference in these two means.
b) Include the output from Minitab or Statcrunch showing...
A psychologist is interested in constructing a 95% confidence interval for the proportion of people who...
A psychologist is interested in constructing a 95% confidence
interval for the proportion of people who accept the theory that a
person's spirit is no more than the complicated network of neurons
in the brain. 71 of the 811 randomly selected people who were
surveyed agreed with this theory. Round answers to 4 decimal places
where possible.
a. With 95% confidence the proportion of all people who accept
the theory that a person's spirit is no more than the complicated...
A psychologist is interested in constructing a 99% confidence interval for the proportion of people who...
A psychologist is interested in constructing a 99% confidence
interval for the proportion of people who accept the theory that a
person's spirit is no more than the complicated network of neurons
in the brain. 57 of the 708 randomly selected people who were
surveyed agreed with this theory. Round answers to 4 decimal places
where possible. a. With 99% confidence the proportion of all people
who accept the theory that a person's spirit is no more than the
complicated...
A psychologist is interested in constructing a 90% confidence interval for the proportion of people who...
A psychologist is interested in constructing a 90% confidence
interval for the proportion of people who accept the theory that a
person's spirit is no more than the complicated network of neurons
in the brain. 69 of the 823 randomly selected people who were
surveyed agreed with this theory.
a. With 90% confidence the proportion of all people who accept
the theory that a person's spirit is no more than the complicated
network of neurons in the brain is betweenand...
A psychologist is interested in constructing a 90% confidence interval for the proportion of people who...
A psychologist is interested in constructing a 90% confidence
interval for the proportion of people who accept the theory that a
person's spirit is no more than the complicated network of neurons
in the brain. 64 of the 765 randomly selected people who were
surveyed agreed with this theory. Round answers to 4 decimal places
where possible.
a. With 90% confidence the proportion of all people who accept
the theory that a person's spirit is no more than the complicated...
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