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Find/discover an example of statistics in the news to discuss the following statement that represents one of the objectives of statistics analysis: "Statistics helps us make decisions based on data analysis." Briefly discuss how the news item or article meets this objective.
Letting μ be the mean composite satisfaction rating for the gaming console, we find that the test should be H o : μ ≤ 42 versus H a : μ > 42
The records of a casualty insurance company show that, in the past, its clients have had a mean of 1.8 auto accidents per day with a variance of 0.0016.
Die with 4 sides {1, 2, 3, 4} is tossed 2 times. Let X equal maximum of two observations and let Y equal minimum. Determine joint pmf of X and Y, and correlation coefficient. Are X and Y independent?
We are interested in testing to see if the variance of a population is less than 7. The correct null hypothesis is:
How does the efficiency of a regression predict the power of the t-test? How do robust standard errors change the comparison between hypothesis testing using OLS and robust regression? What does dependence in the e do to the t-test? what does non-no..
You are presented a 90% confidence interval for the difference in population mean scores (with drug - without drug) of (-17.81, -7.24). What can you conclude from this interval?
Assume the distribution of the length of the cuts follows a normal distribution with a standard deviation of 8 seconds. Suppose we select a sample of 16 cuts from various CDs sold by CRA CD's Inc. What can we say about the shape of the distributio..
Express the null hypothesis and the alternative hypothesis in symbolic form: An entomologist writes an article in a scientific journal, which claims that fewer than 7 in ten thousand male fireflies are unable to produce light due to a genetic muta..
If 50 cups of coffee were measured, what is the probability that: The sample mean per cup is less than 7.8 ounces?
First part of this theorem allows a problem solver to compute probabilities about sample means regardless of whether a population is normally distributed.
If you had a research problem appropriate for ANOVA and it was based on the results from three samples, what would be the null hypothesis?
The weights (in grams) of four different colors of M&M candies are given below, along with the mean weight and variance of each color, and the variance of the sample means.
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