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Information from AAA indicates that the mean age of passenger cars in the US is 8.4 years. A sample of 40 cars in the student lots at the local university showed the mean age to be 9.2 years. The standard deviation of this sample was 2.8 years. At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students?
a. Compute the value of the test statistic.
b. What is the critical value of the test statistic.
If we wanted to shorten the interval of the estimation of the true mean of Saturday sales to a width of $600 in total, what should the size of our sample be to achieve it?
Make a histogram showing the probabilties of r = 0, 1, 2, 3, 4, 5, 6, 7 or 8 defective syringes in a random sample of 8 syringes.
Design a Linear programming problem for the flair Furniture Company and find the combination of tables and chairs that the company must produce to maximize profits.
Place the steps below in the correct order for the construction of a control chart.
Given sample data arranged in a frequency distribution table. Use Excel to calculate the sample mean and variance from this data set.
Taking α to be 0.05, what is/are the critical values associated with testing your hypothesis?
Could mud-wrestling be the cause of a rash contracted by University of Washington students in the spring of 1992? Two physicians at the University of Washington health center wondered this when one male and six female students complained of rashes..
Confirm whether given random variable is binomial distribution or not. If this experiment is finished with replacement, explain why.
What is the best estimate of the average tread life in miles for the entire population of these tires?
An automobile insurance company estimates the following loss probabilities for the next year on a $25,000 sports car:
Formulate the null and alternative hypotheses for this application.
When is it important to have matched pairs rather than two independent sets of data?
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