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Are the customers dissatisfied? An automobile manufacturer would like to know what proportion of its customers are dissatisfied with the service received from their local dealer. The customer relations department will survey a random sample of customers and compute a 95% confidence interval for the proportion that are dissatisfied.
From past studies, they believe that this proportion will be about 0.15. Find the sample size needed if the margin of error of the confidence interval is to be no more than 0.02.
Develop a list of four elements (variables) you would like to use to "measure" the association between exposure to violence and future criminality. Provide a brief explanation of the reasons you chose the variables.
Show some work for each part. A diagram can be helpful. A survey of adults found the following: 65 percent of the adults drink coffee. 35 percent drink tea. 80 percent drink coffee or tea (or both). If we choose a surveyed adult at random, find t..
In a national wide survey a researcher expects 30 percent of the population will agree with an value statement. He wishes to have less than 2% error and 95% confident. What sample size is needed?
In many state lotteries you can choose which numbers to play. Consider a common form in which you choose 5 numbers. Which of the following strategies can improve your chance of winning? If the method works, explain why. If not, explain why using a..
What is the area between the mean and 395 pounds? What is the probability of selecting a value at random and discovering that it has a value of less than 395 pounds
Calculate the Average Variable Cost Function
We assume that the population is approximately normally distributed. Find the confidence interval: for a confidence level of 95%:
the amount of paint required to paint a surface with an area of 50 m2 is normally distributed with mean 6 l and
b. State the reduced regression models for testing for interaction and factor A and factor B main effects, respectively. Fit these reduced regression models.
The table also includes the t-value for testing the null hypothesis of no correlation (i.e., for testing H0 : β1 = 0). Interpret these results.
The length of human pregnancies is approx. normally distributed (ND) with mean of 266 days and standard deviation of 16 days. Find the probability that a pregnancy will
When would you use hypothesis testing and when would you use confidence intervals?
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