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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. What is the probability of a type I error?
b. Give the formula for the test statistic.
If one invested in Stock A, Determine standard deviation of percentage return?
Each egg was also measured for volume using a water displacement method. We wanted to know if the two methods agreed or not
Construct a 95% confidence interval for the difference in the proportions of women and men who have regular exercise programs.
Suppose that population has normal distribution. Determine a 95 percent confidence interval for population standard deviation sigma.
Smaller the p-value in test of hypothesis, the more important the results are.
where the deviations εi are assumed to be independent and Normally distributed with mean 0 and standard deviation σ. This model was fit to the data using the method of least squares. The following results were obtained from statistical software.
Compare 2 moving averages using MSE and compute Exponential smoothing. The subsiquent data which represents demand for company ABC's products for the last 10 months.
Suppose that sales of lemonade and sales of brownies are independent, determine standard deviation in his revenue.
Find out the probability that a student from the whole school system, chosen at random, has passed?
The conservative degrees of freedom for the t distribution are and The standard error, conservative degrees of freedom
An experiment was performed to investigate lifetime of a component exposed to high heat. Three different oven types were used at either 550°F or 600°F.
What is the probability that the mean contents of a six-pack are less than 12 ounces and what is the chance I find at most two defectives in the sample
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