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The mean weight of trucks traveling on a particular section of i-475 is not known. a state highway inspector needs an estimate of the mean. he selects a random sample of 49 trucks passing the weighing station and finds the mean is 15.8 tons. the sample standard deviation is 5.0 tons. what is the 95 percent interval for the population mean?
When 297 college students are randomly selected and surveyed, it is found that 126 own a car. Find a 99% confidence interval for the true proportion of all college students who own a car.
The probability that at least 5 children out of 10 in a sample taken from a school may have a blood level that may impair development is?
The data below show the average daily high temperature for Chicago, Illinois, for twelve recent spring and summer months. Construct a stem-and-leaf diagram for the data:
Identify the independent and dependent variables. Perform a regression analysis on the data.
The sample mean is 2.59 and the sample standard deviation is .66. Conduct the following test using 95% level of confidence.
Is there evidence that the change was successful in reducing the wait time? (use 0.05 level of significance)
What is the probability that the next 100 customers will spend an average of less than $56 on dinner?
As the Marketing Director of Harley-Davidson, you need to determine what your customers would like in the next model. You put a survey on the Harley Web site. Is this a good frame from which to select your sample? Explain.
A sample of 35 different HR departments found that employees worked an average of 240.6 days a year. If the population standard deviation is 18.8 days
To test whether the population mean is less than a specified value.
What is the probability that exactly 7 cabinets are defective? What is the probability that there are more than 8 defective file cabinets?
Either direction from what would have been obtained by interviewing all voters in the United States. Find the sample size suggested by this statement.
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