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The estimated fuel economy for a 2014 Toytoa Highlander 6 cylinder using premium fuel is a normally distributed random variable with a mean of 25.50mpg and a standard deviation of 2.25 mpg.
(1) What is the standard error of X, the mean from a random sample of 25 fill ups by one driver? (round your answers to 4 decimal places)
(2) Within what interval would you expect the sample mean to fall with a 98% probability? (round your answers to 4 decimal places)
Suppose X and Y are two random variables with joint PMF that is approximately bivariate normal. Suppose that observing X reduces your prediction standard deviation ofY by a factor of 2.5. What is the correlation between Y and X?
State the null hypothesis H0 and the alternative hypothesis Hain each case. Be sure to identify the parameters that you use to state the hypotheses.
For each frequency distribution listed, tell whether it is positively skewed, negatively skewed, or approximately symmetrical (bell-shaped or rectangular).- Age of all people alive today.
A real estate agent likes to predict the selling price of a home based on several variables: size, location, condition, # of bedrooms, etc.
One thousand students at a city high school were classified according to both GPA and whether or not they consistently skipped classes.
How to start a project on gender discrimination? From where to start? and where to end?
Heights are sampled of kids from three schools. Using a 0.05 significance level, if when looking at ANOVA results, your p-value is 0.04, what can you say about your sample data? No minimum word count.
Men's heights A report of the National Center for Health Statistics says that the height of a 20-year-old man chosen at random is a random variable.
State the main points of the Central Limit Theorem for a mean. Why is population shape of concern when estimating a mean? What does sample size have to do with all?
What is the amount of their monthly loan payment to amortize the loan?
If the airline industry proudly announces that it has set a new record for the longest period of safe flights, would you be reluctant to fly? Are the airlines due to have a crash?
If the cost of electricity is $0.10/kWh, determine the cost of electricity per year.
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