Calculus and Above

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Use the given degree of confidence and sample data to
Use the given degree of confidence and sample data to construct a confidence interval for the population mean μ. Assume that the population has a normal distribution.A sociologist develops a test to m… read more
Kofi
PhD in Statistics
Ph.D.
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A sample of 110 body temperatures having a mean of 98.20 F
A sample of 110 body temperatures having a mean of 98.20 F and a sample standard deviation of 0.62 F. Construct a 95% confidence interval to estimate the standard deviation of body temp. Round to thre… read more
Sandhya_sharma
Master's Degree
Master's Degree
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A random sample of 200 adults was given a IQ test. It was
A random sample of 200 adults was given a IQ test. It was found that 118 of them scored higher than 100. Based on this compute a 90% confidence interval for the proportion of all adults whose IQ score… read more
Tom
Engineer
Master's Degree
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My question is similar to the question that you previously
Hello, my question is similar to the question that you previously answered except the number of hires, means and deviations are different numbers. Is there a charge for your assistance?… read more
Ashleigh T
Educator
Master's Degree
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A psychologist is interested in the mean IQ score of a group
A psychologist is interested in the mean IQ score of a group of children. It is known that the IQ scores of the group have a standard deviation of 16. The psychologist randomly selects 150 children fr… read more
akch2002
Master's Degree
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The mean diastolic blood pressure for a random sample of 70
The mean diastolic blood pressure for a random sample of 70 people was 85 millimeters of mercury. If the standard deviation of individual blood pressure readings is known to be 11 millimeters of mercu… read more
rajeevanpillai
Master's Degree
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A psychologist wants to estimate the standard deviation of
second opinion] A psychologist wants to estimate the standard deviation of IQ scores. It is widely believed that the IQ scores follow a normal distribution. Her random sample of 24 IQ scores has a mea… read more
Kimberley Wright
Masters
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The standard deviation of test scores on a certain
The standard deviation of test scores on a certain achievement test is 11.4. A random sample of 60 scores on this test had a mean of 72.3. Based on this sample, find a 99% confidence interval for the … read more
Kofi
PhD in Statistics
Ph.D.
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A psychologist wants to estimate the standard deviation of
A psychologist wants to estimate the standard deviation of IQ scores. It is widely believed that the IQ scores follow a normal distribution. Her random sample of 24 IQ scores has a mean of 96.5 and a … read more
Ann
Tutor
MSC Mathematics
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A psychologist wants to estimate the standard deviation of
A psychologist wants to estimate the standard deviation of IQ scores. It is widely believed that the IQ scores follow a normal distribution. Her random sample of 24 IQ scores has a mean of 96.5 and a … read more
Kofi
PhD in Statistics
Ph.D.
7,955 satisfied customers
The lifetime of a certain brand of electric light bulb is
The lifetime of a certain brand of electric light bulb is known to have a standard deviation of 55 hours. Suppose that a random sample of 100 bulbs of this brand has a mean lifetime of 481 hours. Find… read more
Kimberley Wright
Masters
323 satisfied customers
A psychologist is interested in the mean IQ score of a given
A psychologist is interested in the mean IQ score of a given group of children. It is known that the IQ scores of the group have a standard deviation of 15. The psychologist randomly selects 50 childr… read more
Kofi
PhD in Statistics
Ph.D.
7,955 satisfied customers
The lifetime of a certain brand of electric light bulb is
The lifetime of a certain brand of electric light bulb is known to have a standard deviation of 45 hours. Suppose that a random sample of 70 bulbs of this brand has a mean lifetime of 495 hours. Find … read more
Kimberley Wright
Masters
323 satisfied customers
The human resources department of a consulting firm gives a
The human resources department of a consulting firm gives a standard creativity test to a randomly selected group of new hires every year. This year, 90 new hires took the test and scored a mean of 11… read more
Sandhya_sharma
Master's Degree
Master's Degree
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A research company desires to know the mean consumption of
A research company desires to know the mean consumption of milk per week among males over age 45. A sample of 1842 males over age 45 was drawn and the mean milk consumption was 4.9 liters. Assume that… read more
Sandhya_sharma
Master's Degree
Master's Degree
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1. A random sample of 92 observers produced a mean X = 25.8
1. A random sample of 92 observers produced a mean X = 25.8 and a standard deviation s = 2.6. a) Find a 95% confidence interval for 11. b) Find the 90% confidence interval for Jl c) Find the 99% confi… read more
Ryan
Bachelor's Degree
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a) From the information given here, determine the 95% confidence
a) From the information given here, determine the 95% confidence interval estimate of the population mean. Xbar = 100 σ = 20 n = 25 b) Repeat part (a) with xbar = 200. c) Repeat part (a) with xbar = 5… read more
Chirag
Master's Degree
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1. a) From the information given here, determine the 95% confidence
1. a) From the information given here, determine the 95% confidence interval estimate of the population mean. Xbar = 100 σ = 20 n = 25 2. b) Repeat part (a) with xbar = 200. c) Repeat part (a) with xb… read more
Chirag
Master's Degree
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