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In a survey on the quality of customer service at Car Toys, customers were asked to rate the service on a scale from 1 to 10, with 10 being that a customer was completely satisfied. Assume that the distribution of the responses can be approximated by a normal distribution with a mean of 7 and a std deviation of 1.
a. What is the probability that an individual customer gives a rate of at least 8?
b. In a random sample of 10, what is the probability that the average rating is at least 8?
If the company does not want to replace more than 5% of the televisions?
Among 500 freshmen pursuing a business degree at a university, 347 are enrolled in an economics course, 204 are enrolled in a mathematics course, and 160 are enrolled in both an economics and a mathematics course.
What is the decision regarding the null hypothesis (is there a difference in the mean numbers of cameras sold at the three department store chains)?
Do these simulated data provide evidence for us to conclude that a difference in the spinal canal cross sectional area exist between the population of subjects with disc hernination and a population of those who do not have disc hernation?
Test the mean cholesterol content in the egg is greater than 2.5 percent
A survey of the number of calls received by a sample of Southern Phone Company subscribers last week revealed the following information.
Illustrate what is the probability all four calls are infact emergencies. Illustrate what is the probability that three or more calls are not emergencies.
Using this information, calculate Blpha risk (probability of Type II error) if the true population mean really is 81.
Determine the probability that none of the calculators will be defective?
Scores on an endurance test for cardiac patients are normally distributed with mean = 182 and standard deviation = 24.
Consider in you response how the concepts of a population (and its associated parameters) and the sample (and its associated estimates) fits into the discussion.
Multiple choice questions based on regression - dependent variable Y and an independent variable X is provided.
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