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A cell phone company offers two plans to its subscribers. At the time new subscribers sign up, they are asked to provide some demographic information. The mean yearly income for a sample of 40 subscribers to Plan A is $59,100 with a standard deviation of $9,200. For a sample of 30 subscribers to Plan B, the mean income is $63,000 with a standard deviation of $7,100. At the .01 significance level, is it reasonable to conclude the mean income of those selecting Plan B is larger? Hint: For the calculations, assume the Plan A as the first sample. The test statistic is ???? . (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
a study was conducted to estimate hospital costs for accident victims who wore seat belts. twenty randomly selected
What is the probability that a debt for borrower with good credit is less than $10,000?
Calculating a Z-score and graphing a box plot and Statistical Inference of Sample Mean , Binomial Distribution and Regression Analysis
Deceptive Statistics
Create the second data set by inserting eight data points all very close to 10 on the number line and record the standard deviation of this data set, and then delete that data set.
keays et al. 2003 conducted a correlational study to determine the relationship between muscle strength and functional
In a regression analysis, a nurse researcher found a correlation of between pain relief scores and satisfaction with nursing care.
Let variable X represents the improvement in time for each assembly line worker. Let μ represents the average improvement in time for the population. Has the training improved the time required on the job? Please test the hypothesis use α=0.05 ..
Prepare a report using the numerical methods of descriptive statistics presented in this module to learn how the variables contribute to the success of a motion picture.
question 1. what would be the appropriate statistical procedure to test the following hypothesisnbsp triglyceride
the following data are availableresp nbspnbsp age nbspnbspnbsp exam nbsp papernbspnbsp sex nbspnbspnbspnbsp
question 1 a normal population has a mean of 78 and a standard deviation of 6. you select a sample of 50. evaluate the
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