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The life expectancy of Timely brand watches is normally distributed with a mean of four years and a standard deviation of eight months.
a. Ninety-five percent of the watches will have a life expectancy of at least how many months?
A sample is taken prior to a major election of likely voters. The null hypothesis is that the votes will be split 50/50. One candidate gets 54% of the support in the sample and the p-value for this sample is calculated to be 0.12.
Test the financial analyst's belief that the average rate charged by credit cards with monthly fees is less than 14%. Use a 5% significance level.
Find probability using normal distribution.Using N (1152, 84), the Normal model for weight of Angus steers, what percent of steers weigh.
Calculate the mean of the 20 samples and draw a histogram showing the 20 sample means and describe the distribution of the x-bars that you see in part b (shape of distribution, center, and the amount of dispersion).
The demand for airplane passengers (Y) is a function of a average fare (X1), the fare of the competing airline, and the annual per capital income of the passengers(X3)
Determine the minimum sample size required using prior study that found that 54% of respondents said they have high-speed Internet access.
What distinguishes regression from ANOVA? What are the assumptions and limitations of each, and when should one be used in place of the other
Suppose that a researcher does a study to see how level of anxiety (A 1 = low, A 2 = medium, A 3 = high) is used to predict exam performance (Y).
Historically the average age of European soccer players is reported as 26 years with a standard deviation of 4 years. A random sample of 81 European professional soccer players has an average age of 27 years.
What are some conditions under which business decisions are made using subjective probability concepts? Could you please cite two examples of subjective probability.
A 10 year study by the American Heart Association provided data on how age, blood pressure and smoking relate to the risk of strokes.
The moment generating function of normal distributed random variable ,Y, with mean and variance .derive the moment generating function of X=-3Y+4.what is the distribution of X? why?
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