Calculus and Above

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A light bulb manufacturer wants to compare the mean
A light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A and model B. Independent random samples of the two models were taken. Analysis of 13 bulbs of model A s… read more
Sandhya_sharma
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The following data show the costs charged by a tax
The following data show the costs charged by a tax preparation service for a random sample of 15 tax returns. Complete parts a through c. ​\$130 ​\$105 ​\$135 ​\$200 ​\$95 ​\$115 ​\$90 ​\$200 ​\$135 ​\$80 ​\$155… read more
Scott
Master's Degree
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1. Mrs. recorded the number of pins on the water. There were
1. Mrs. Brown recorded the number of pins on the water. There were __37__ pins in the water and _13__ pins on the soil (non-water points). 2. Use Excel to calculate a sample proportion of points that … read more
Scott
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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In a sample of 325 college seniors, 263 responded positively
In a sample of 325 college seniors, 263 responded positively when asked if they had spring fever. Based upon this, compute a 95% confidence interval for the proportion of all college seniors who have … read more
Kofi
PhD in Statistics
Ph.D.
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A researcher wishes to estimate the proportion of x-ray
A researcher wishes to estimate the proportion of x-ray machines that malfunction. A random sample of 250 machines is taken, and 57 of the machines in the sample malfunction. Based upon this, compute … read more
Kofi
PhD in Statistics
Ph.D.
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A researcher wishes to estimate the proportion of x-ray
A researcher wishes to estimate the proportion of x-ray machines that malfunction. A random sample of 225 machines is taken, and 67 of the machines in the sample malfunction. Based upon this, compute … read more
Ann
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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
Ann
Tutor
MSC Mathematics
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The score is on an examination psychologyAre approximately
The score is on an examination psychologyAre approximately normally distributed with mean 500 and an unknown standard deviation. The following is a random sample of scores from this examination. 417, … read more
Ann
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MSC Mathematics
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A Random sample of 175 adults was given an IQ test. It was
A Random sample of 175 adults was given an IQ test. It was found that 91 of them scored higher than 100. Based on this, compute a 90% confidence interval for the proportion of all adults whose IQ scor… read more
Kofi
PhD in Statistics
Ph.D.
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20 years ago, a very famous Psychologist specializing in
20 years ago, a very famous Psychologist specializing in marriage counseling authorize a book detailing the way in which she believes spouses should communicate. She is now interested in the proportio… read more
Kofi
PhD in Statistics
Ph.D.
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I have a quiz question i also got wrong. In a survey of
I have a quiz question i also got wrong.In a survey of American drivers, 80% of women drivers and 86% of men drivers said that they exceeded the speed limit at least once in the past week. Suppose tha… read more
Sandhya_sharma
Master's Degree
Master's Degree
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On the Navajo Reservation, a random sample of 220 permanent
On the Navajo Reservation, a random sample of 220 permanent dwellings in the Fort Defiance region showed that 52 were traditional Navajo hogans. In the Indian Wells region, a random sample of 141 perm… read more
Sandhya_sharma
Master's Degree
Master's Degree
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Estion A sociologist is studying the prevalence of crime in
estionA sociologist is studying the prevalence of crime in one major city. In a sample of 200randomly selected residents, 62say that they have been victimized by a criminal. Based on this sample, cons… read more
Sandhya_sharma
Master's Degree
Master's Degree
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Pilots who cannot maintain regular sleep hours due to their
Pilots who cannot maintain regular sleep hours due to their work schedule often suffer from insomnia. A recent study on sleeping patterns of pilots focused on quantifying deviations from regular sleep… read more
Sandhya_sharma
Master's Degree
Master's Degree
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Question 10 - A random sample of size n= 20 was drawn from
Question 10 - A random sample of size n= 20 was drawn from a population of size N= 200. The measurements shown in the table below were obtained. 38 24 49 24 29 22 52 25 40 51 26 40 26 38 51 40 48 41 4… read more
Chirag
Master's Degree
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I need help with homework questions. They are multiple choice
I need help with homework questions. They are multiple choice questions in intro to statistics and they have to be done today. They do not have to be perfect as you can redo the homework as many times… read more
Stevewh
Teacher
Bachelor's Degree
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16. In a survey of 630 males ages 18-64, 391 say they have
16. In a survey of 630 males ages 18-64, 391 say they have gone to the dentist in the past year. Construct 90% and 95% confidence intervals for the population proportion. Interpret the results and com… read more
Sandhya_sharma
Master's Degree
Master's Degree
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