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A study of elephants is conducted to determine the average weight of a certain subspecies of elephants. The standard deviation for the population is 500 pounds. At a 80% level, how many elephants need to be weighed so the average weight will be accurate to within 350 pounds?
If battery posts are larger than 3.5 centimeters or less than 3.30 centimeters, they will be scrapped. Determine the proportion scrapped?
What is the probability that: The first randomly selected drinker qualifies? Three sports drink users will have to be interviewed to find the first Gatorade drinker?
To compare the effectiveness of two treatments 1 and 2 for a particular disease. Patients were separated in 2 treatment groups. A patient in group 1 received treatment 1 and patients in group 2 received treatment 2.
Determine the expected frequencies for each of the cells in the following contingency tables. For each problem, state how many of the expected values actually had to be computed and how many could be found by subtraction.
If the speed of lights is 3.00x 10 to the power of 8 m/sec, how long does it take light to travel 2.29x 10 to the power of 11 m, the distance from the sun to Mars? Round to one decimal place.
The National Highway Association is studying the relationship between the number of bidders on a highway project and the winning (lowest) bid for the project.
Surveys 32 currents students discovering that 12 will return for summer school. b. with a 0.95 probability, how large of a sample would have to be taken to provide a margin of error of 3% or less?
Problems on Sampling Variability and Standard Error and Confidence Intervals
Bill calculates a linear correlation coefficient between two variable as 1.20. How would you interpret this?
Make use of normal probability distribution features of EXCEL to help determine the probability.
Jasmine is an African American graduate student. She is conducting research on the effects that affirmative action programs have had on American corporations.
Plot CEO salaries against the net profit of their respective companies, do you expect to find a linear correlation between the two?
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