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Astudy of the weights of the brains of swedish men found that the weight X was a random variable with mean 1400 grams and standard deviation 20 grams. Find positive numbers a and b such that Y=a+bX has a mean 0 and standard deviation.
How can you or your department decide whether or not the variation is important? How could using a mean difference test help?
Identify each of the random variables as continuous or discrete.
A new speed limit will be initiated such that approximately 10% of vehicles will be over the speed limit. What is the new speed limit based on this criterion? In what way do you think the actual distribution of speeds differs from a normal distribu..
1) There are 500 employees in a firm, 45% are female. A sample of 60 employees is selected randomly. a) Determine the standard error of the proportion.
Develop a pie chart to summarize these contributions. Develop a bar chart to summarize these contributions and why is it appropriate to construct a bar chart for these data instead of a histogram?
Calculate a 95% confidence interval for the population mean, based on the sample 10, 12, 13, 14, 15, 16, and 49.
tudent from the high school is arbitarily selected. Reply the following questions: Determine the probability that the student's ACT score is less than 22?
What is the approximate estimated bootstrap standard error of the median, What is the approximate bias of the median estimated from bootstrapping - What is the bootstrap t confidence interval for the median
The sameple you found that 114 of those adults sampled over the age of 24 smoke. Develop a 95% condience interval for the current porportion of adults over the age of 24 who smoke.
For each of the following, indicate whether the type of probability involved is an example of a priori probability, empirical probability, or subjective probability.
Critically illustrate out the difference between a histogram and a dot plot. When might a dot plot be better than a histogram?
Conduct a two-sample test of means. A study by a bank compared the average savings of customers who were depositors for three years or less with those who had been depositors for more than three years.
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