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A sample of 3000 observations has a mean of 82 and a standard deviation of 16. Using the empirical rule, find what percentage of the observations fall in the intervals , and x+/- 1s, x+/- 2s x+/- 3s.
In playing the Lemonade Stand Game, Bob decreased his price per cup by two cents, from $.27 per cup to $.25 per cup. At the .05 level of significance, did net revenue increase?
Random sample of 85 group leaders, spent 6.5 years on job before being promoted standard deviation of sample was 1.7 years create 95 percent confience interval.
At the 5% significance level, can the station conclude that the mean age of its listeners is not 25 yrs. Formulate and test the appropriate hypotheses. Use the critical value approach.
Assume that the mean SAT score in Mathematics for 11th graders across the nation is 500, and that the standard deviation is 100 points. Find the probability that the mean SAT score for a randomly selected group of 150 11th graders is between 475 a..
Question: If the regression line is drawn as Y = C + 1075x, when X was 2 and y was 239, given that the intercept was 11. Calculate the residual
Assumed to have 20 pounds of carry-on baggage, find the probability that his total is greater than 195 pounds. Round your answer to three decimal places.
What type of test is described below and can you provide the null and alternate hypothesis? Using an old manufacturing process.
Can you tell me why is a data analysis plan important for good business research? What are descriptions of some of a plan's major components and what data analysis tools can be included.
During 2001, 61.3% of US households purchased ground coffee.These households spent an average of $36.16 on ground coffee during the year.
Of the drivers who stop at a gas station, 92% purchase gasoline, and 6% purchase both gasoline and oil. A total of 7% purchase oil.
You have an observed mean of 55, an observed standard deviation of 12. Which Z value is associated with each raw score below?
How large should n be so that Chebyshev's inequality guarantees that the estimate is within 5 centimeters from h, with probability at least 0.99?
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