Experience with workers in a certain industry indicates that the time required for a worker to randomly perform a task is distributed in an approximately normal manner, with a standard deviation of 12 minutes. A sample of 25 workers provided an average of 140 minutes. The 95% confidence limits for the arithmetic mean of the population of workers who perform that particular service are:

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A: Given information: n1=51M1=40,000s1=5100n2=80M2=60,000s2=8000 a) the difference of the sample means:…

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Q: Suppose that the sample dataset of July 1 temperatures consisted of 64 observations and that these…

A: given data standard deviation s = 4 sample size n = 64

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A:

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A: Note: According to bartleby experts question answers guidelines an expert can solve only first three…

Q: Calculate a 95% upper confidence bound for the mean of a normally distributed population using the…

A: Given that, x = 32289  s = 2846  n=15  For 95% confidence interval,the z value is 1.96

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A: Given that  Sample sizes n1=70      , n2=85       Sample means X̄1=8.84     , X̄2=9.05      ?1 =0.30…

Q: Total enrollment in the Kalamazoo Public Schools have a mean and standard deviation of 11,727.4 and…

A: Total enrollment in the Kalamazoo Public Schools have a mean and standard deviation of 11,727.4 and…

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Q: Company ABC's customer retentions per site are normally distributed with a standard deviation of 21…

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A:

Q: A standardized test for graduate school admission has a mean score of 156 with a standard deviation…

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Q: Consider the following two datasets: Dataset 1                       Dataset 2 1      9…

A:

Q: Suppose I surveyed a random sample of commuters who had jobs in Manhattan, 51 whose primary mode of…

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Q: recent Gallup poll interviewed a random sample of 1523 adults. Of these 868 bought a lottery ticket…

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Q: A high school athletic director is asked if basketball players are doing as well academically as the…

A: Given that  Sample size n =20 Sample mean =3.18 Sample standard deviation =0.54

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A: From the given information we conduct t test for one mean.

Q: number of cavity t са

A:

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Q: An arborist is interested in determining the mean diameter (in centimeters) of mature white oak…

A: Given: n=7, x=49.09 and s=13.8.   At 95% confidence level, the value of z is 1.96.

Q: According to the College Board, scores on the math section of the SAT Reasoning college entrance…

A: Given information, Mean =516 Standard deviation =116

Q: a. H0: _______ b. Ha: _______ c. In words, CLEARLY state what your random variable X represents.…

A:

Q: The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million…

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Q: Fifteen randomly selected college students were asked to state the number of hours they slept the…

A: Comment: As per the our company guidelines we are supposed to answer only three subparts. Kindly…

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Q: a. N (4.87, 0.0129)

A: The cost of unleaded gasoline in the Bay Area once followed an unknown distribution with a mean of $…

Q: A hypertension trial is mounted, and 12 participants are randomly assigned to receive either a new…

A: The type of test is two tailed test The appropriate test is two sample t-test using equal variances

Q: Consider a data set that has a mean of 82.7 and a standard deviation of 14.1. According to…

A: From the given information mean = 82.7 and standard deviation= 14.1. We want to find 91.14 %…