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Please test, at the significance level of 0.05, whether the mean bacteria count for the plant discharge exceeds that for the upstream location.
What percentage of personal checking account customers carry average daily balances in excess of $800? What percentage of the bank's customers carries average daily balances below of $200?
The profit per loaf of bread sold in the supermarkets is .03 and the loss per loaf bread returned is .018. If u=60,000 and o=4,000 per day, how many loaves should Amazing bake daily?
It is estimated that .54 percent of the callers to the Customer Service department of Dell Inc. will receive a busy signal. What is the probability that of today's 1,300 callers at least 5 received
To test this claim, a researcher obtains information about registered drivers from the department of motor vehicles and selects a sample of n=300 accident reports from the police department.
A survey of 600 non-fatal accidents showed 259 involved the use of a cell phone. Construct a 99% confidence interval for the proportion of fatal accidents that involved the use of a cell phone?
please help, In 1992, the FAA conducted 24,000 pre-employment drug tests on job applicants who were to be engaged in safety and security-related jobs, and found that 800 were positive.
A backpack full of books weighing 61.0 N rests on a table in a physics laboratory classroom. A spring with a force constant of 150 N/m is attached to the backpack and pulled horizontally, as indicat
Construct a 94% confidence interval for the true percentage of smokers among all people who completed four years of college.
A company manufactures automobile transmissions. It has been determined that the lifetime (time until failure) of this transmission is normally distributed with an average of 78,000 miles and
If they didn't launch new mixing plant another alternate can contribute twenty fivemillion profit for the same period (i.e. estimated 6 years) (a) Draw the complete decision tree and determine wheth
A standard deviation of 7. what is the probability that a randomly selected student from this class will have a grade lower than 65?
A professor is targeting a score of 80 on an exam. His forty-nine students averaged 78 on an exam with s = 7. Are the scores significantly less than 80 at a significance level of 0.05? Show your wor
Bob's base life-guarding pay is $12 per hour for each 8 hour day. Taking into account the extra-effort days that sometimes occur, what is Bob's average pay for an 8 hour day?
Could this information be viewed as representing the nominal scale of measurement? If so explain why. If not, why not?
a report states that 57% of home owners had a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have gardens to within 3% with 95% confidence?
When they are not accurate, behavior stated in the following table.e.g P(BUZZ consultant predict about Low market | When actual market is High) = 19% Draw the complete decision tree and calculate the
A student is interested in whether students who study with music playing devote. What statistical test should be used to analyze these data?
if 80% of adults like beer, and 4 adults were picked at random, what is the probability all 4 like beer?
A car with a certain protection system will be recovered 86% of the time. If 700 stolen cars are randomly selected, what is the mean and standard deviation of the number of cars recovered after bein
24 such deaths would be expected based on statewide mortality rates. Is the number of deaths from COPD in this group excessive?
What is the probability that a single, randomly selected piece of material will be defective? (Give the answer to two decimal places.)
How large a sample should she check in order to be 93 percent confident that the true proportion is estimated to within 0.014?
A biologist estimates that 40% of deer in the region carry a certain type of tick. For a sample of 300 deer selectetd at random, what is the chance that 124 or fewer deer have this tick?
It was found that the mean waiting time was .46 minutes, with a standard deviation of .16 minutes. at the .05 level of significance, can we reject the official's claim?