11/26/24

Hypotheses Testing
A recent poll stated that out of the 40 people interviewed, 22 of them drove to work. Create a 95% confidence interval for the true percentage of people who drive to work. Pick the correct... more
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09/01/22

Phone call charges
For a long-distance person-to-person telephone call, a telephone company charges $0.36 for the first minute, $0.26 for each additional minute, and a $2.28 service charge. If the cost of a call is... more
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06/02/21

finding the estimated area to the right side of a normal curve

karla tutors statistics during her summer vacation. the random variable T represents how much money she makes. assume T is normal and has a mean of $240 and a standard deviation of $60 . There is... more
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04/22/21

A researcher claims that all call center agents sleep for an average that is less than or equal to 7.5 hours per day with a population standard deviation of 1.4 hours per day.

A researcher claims that all call center agents sleep for an average that is less than or equal to 7.5 hours per day with a population standard deviation of 1.4 hours per day. To validate the... more
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04/22/21

Two years ago, the average acres of farms in a certain geographic region was 55 acres.

Two years ago, the average acres of farms in a certain geographic region was 55 acres. The standard deviation of the population was 10 acres. A recent study consisting of 25 farms showed that the... more
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05/03/19

hypothesis testing

In a survey conducted by a website, employers were asked if they had ever sent an employee home because they were dressed inappropriately. A total of 2753 employers responded to the survey,... more
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12/05/14

a. Suppose the FDA wishes to conduct a hypothesis test to evaluate the null hypothesis that the population mean is 260 milligrams. Conduct this hypothesis test
Suppose the FDA wishes to conduct a hypothesis test to evaluate the null hypothesis that the population mean is 260 milligrams. Conduct this hypothesis test for the FDA. Please conduct this... more
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11/09/14

find the probability
: 70% of residents have reduced their electricity usage sufficiently to qualify for discounted rates. If 5 residential subscribers are randomly selected A. What is the probability that all five... more
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03/13/13

For the following data, calculate the difference between the means distribution parameters. n1 = 25, n2 = 36, s12 = 50, s22 = 72, M1 = 100, M2 = 105
Please show me the work
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