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Suppose that you want to estimate the 99% CI for the average number of hours that middle school students play video games per month. For a random sample of 100 middle school students, the mean and
Suppose X and Y are independent random variables. Find the density for Z = X + Y. Verify that it integrates to 1. Find the median (the value of z for which P(Z =< z) = 1/2)
Assuming the weight of cereal is normally distributed, determine the likelihood that a package will contain more than 12.2 ounces. Calculate using megastat.
For a random sample of 9 women, the average resting pulse rate is x = 76 beats per minute, and the sample standard deviation is s = 5. The standard error of the sample mean is ??
In a random sample of 60 dog owners enrolled in obedience training, it was determined that the mean amount of money spent per owner was $109.33 per class. Assuming the population standard deviation
A market research firm conducts telephone surveys with a 42% historical response rate. What is the probability that in a new sample of 400 telephone numbers, at least 150 individuals will cooperate
An electrical firm manufactures a certain type of light bulb that has a mean life of 1800 hours and a standard deviation of 200 hours. Assume the life of these light bulbs follows a normal distribut
What is the difference between probability sampling and simple random sampling?
Write a paragraph or two summarizing what you can conclude from the summaries you generated. You should address the central tendency, variability, and shape of the data as well as any other feature
Eleanor scores 680 on the mathematics part of the SAT. What is Eleanor's standardized score? Round your answer to 2 decimal places.
(a) State an appropriate pair of hypotheses. (b) State the formula for the test statistic and show your decision rule using the 1 percent level of significance. (c) Carry out the test. Show your wor
random sample of 70 voters found that 42% were going to vote for a certain candidate. Find the 99% confidence limit for the population proportion of voters who will vote for that candidate.
Let be the proportion in a random sample of 50 such corporations that offer retirement plans to their employees. Find the probability that the value of will be?
Suppose that a sample of households in a community is selected at random from the telephone directorty. WHat households are omitted from the frame?
Find and interpret the 90% confidence interval for the 46% of the students that drive more than 20 minutes on their way to class.
In a random sample of 64 customers, there is 85% chance that the sample mean will be below how many minutes? What is the probability that the time spent with each individual customer is at least 3 min
A port CEO wants to study the proportion of ships arriving at his port on time. How many ships must be included in the sample if the CEO wants the error to be within 0.02 and a confidence level of 9
A large department store has 500 employees. There are 350 females and 200 of them are under the age of 25. There are 75 males under the age of 25. If an employee is selected for promotion, find the
Provide a 95% confidence interval for the population proportion of college students who work to pay for tuition and living expenses.
If the manufacturer guarantees the terminals for 3 years (and will replace them if they malfunction), what percentage of terminals will be replaced?
If you randomly meet an MBA from this company, what is the probability that this person is a manager?
Suppose that we wish to have a 99.73 percent chance that all 50 specifications will be met. If each specification will have the same chance of being met, how large must we make the probability of me
Shoppers enter Hamilton Place Mall at an average of 120 per hour. What is the probability that exactly 25 shoppers will enter the mall between noon and 12:10 p.m.?
A salesperson contacts eight potential customers per day. From past experience, we know that the probability of a potential customer making a purchase is .10. What is the average number of sales per
Assume that the class has 60 students and that the examination period is 90 minutes in length. How many students do you expect will be unable to complete the exam in the allotted time (0 decimals)?