Question
In: Statistics and Probability
A random sample of 5562 physicians in Colorado showed that 3062 provided at least some charity...
A random sample of 5562 physicians in Colorado showed that 3062 provided at least some charity care (i.e., treated poor people at no cost).
(a) Let p represent the proportion of all Colorado physicians who provide some charity care. Find a point estimate for p. (Round your answer to four decimal places.)
(b) Find a 99% confidence interval for p. (Round your answers to three decimal places.) lower limit and upper limit
In a survey of 1000 large corporations, 256 said that, given a choice between a job candidate who smokes and an equally qualified nonsmoker, the nonsmoker would get the job.
(c) Let p represent the proportion of all corporations preferring a nonsmoking candidate. Find a point estimate for p. (Round your answer to four decimal places.)
(d)Find a 0.95 confidence interval for p. (Round your answers to three decimal places.)
| lower limit | |
|
upper limit |
and
What is the margin of error based on a 95% confidence interval? (Round your answer to three decimal places.)
Solutions
orchestra answered 1 year agoRelated Solutions
A random sample of 5994 physicians in Colorado showed that 3062 provided at least some charity...
A random sample of 5994 physicians in Colorado showed that 3062
provided at least some charity care.
(a) Let p represent the proportion of all Colorado
physicians who provide some charity care. Find a point estimate for
p. (Round your answer to four decimal places.)
(b) Find a 99% confidence interval for p. (Round your
answers to three decimal places.)
Lower Limit = ?
Upper Limit=?
(c) Give a brief explanation of the meaning of your answer in
the context...
What percentage of hospitals provide at least some charity care? Based on a random sample of...
What percentage of hospitals provide at least some charity care?
Based on a random sample of hospital reports from eastern states,
the following information is obtained (units in percentage of
hospitals providing at least some charity care):
56.8
56.1
53.3
65.6
59.0
64.7
70.1
64.7
53.5
78.2
Assume that the population of x values has an
approximately normal distribution.
(a) Use a calculator with mean and sample standard deviation
keys to find the sample mean percentage x and the sample...
What percentage of hospitals provide at least some charity care? Based on a random sample of...
What percentage of hospitals provide at least some charity care?
Based on a random sample of hospital reports from eastern states,
the following information is obtained (units in percentage of
hospitals providing at least some charity care):
57.2 56.1 53.1 65.8 59.0 64.7 70.1 64.7 53.5 78.2
Assume that the population of x values has an approximately
normal distribution.
(a) Use a calculator with mean and sample standard deviation
keys to find the sample mean percentage x and the sample...
A random sample of 200 physicians indicates that 36 of them make at least $400,000 a...
A random sample of 200 physicians indicates that 36 of them make
at least $400,000 a year. Construct a 99% confidence interval
estimate of the population proportion of physicians who make at
least $400,000 a year. State the conclusion.
A random sample of 200 physicians indicates that 36 of them make at least $400,000 a...
A random sample of 200 physicians indicates that 36 of them make
at least $400,000 a year. Construct a 99% confidence interval
estimate of the population proportion of physicians who make at
least $400,000 a year. State the conclusion.
A random sample of 25 employees for the retailer showed a sample mean of 15.1 minutes...
A random sample of 25 employees for the retailer showed a sample
mean of 15.1 minutes and a standard deviation of 3 minutes. Assume
that the time spent by employees on personal phone calls is
normally distributed. Let μ denote the mean time spent by employees
spent on personal phone calls.
(a) An employee group for a national retailer
claims that the mean time spent by employees on personal phone
calls is more than 20 minutes per day. Specify the...
A random sample of 20 purchases showed the amounts in the table (in $). The mean...
A random sample of 20 purchases showed the amounts in the table
(in $). The mean is $50.76 and the standard deviation is
$19.48
a) Construct a 80% confidence interval for the mean purchases of
all customers, assuming that the assumptions and conditions for
the confidence interval have been met.
b) How large is the margin of error?
c) How would the confidence interval change if you had assumed
that the standard deviation was known to be $20?
60.91
64.3...
A random sample of 20 purchases showed the amounts in the table (in $). The mean...
A random sample of 20 purchases showed the amounts in the table
(in $). The mean is $49.88 and the standard deviation is
$20.86.
B) What is the margin of error ?A) Construct a 80% confidence
interval for the mean purchases of all customers, assuming that
assumptions and conditions for confidence interval have been met.
(What is the confidence interval) ?
C) How would the confidence interval change if you had assumed
that the standard deviation was known to be...
A random sample of 2020 purchases showed the amounts in the table (in $). The mean...
A random sample of
2020
purchases showed the amounts in the table (in $). The mean
is
$49.8149.81
and the standard deviation is
$21.9521.95.
a) Construct a
8080%
confidence interval for the mean purchases of all customers,
assuming that the assumptions and conditions for the confidence
interval have been met.
b) How large is the margin of error?
c) How would the confidence interval change if you had assumed
that the standard deviation was known to be
$2222?
A) The...
A random sample of 89 tourist in the Chattanooga showed that they spent an average of...
A random sample of 89 tourist in the Chattanooga showed that
they spent an average of $2,860 (in a week) with a standard
deviation of $126; and a sample of 64 tourists in Orlando showed
that they spent an average of $2,935 (in a week) with a standard
deviation of $138. We are interested in determining if there is any
significant difference between the average expenditures of those
who visited the two cities? a) Determine the degrees of freedom for...
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