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Given that the salesman had five customers during a given day, what is the probability that he sold exactly two cars? What is the average number of cars sold by the saleman in a one-day period?
Assuming that hypertension in finals week is the same as at other times, what is the probability of getting a sample result as large as ours (p-value)?
Use Appendix Table III to determine the following probabilities for the standard normal random variable Z:
We can be 80% confident that the true proportion of college students with hypertension during finals week is with a margin of error of? . Unless our sample (of 200 donors) is among the most unusual
A job shop consists of three machines and two repairmen. The amount of time a machine works before breaking down is exponentially distributed with mean 10. If the amount of time it takes a single re
State the null hypothesis and the alternate hypothesis. (Round your answers to 2 decimal places.) State the decision rule for .025 significance level. (Round your answer to 3 decimal places.) Compute
What is the decision rule? (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.) Compute the value of the test statistic. (Negative amount should be indicated
Compute the value of the test statistic. (Round your answer to 2 decimal places.) What is the p-value? (Round your answer to 4 decimal places.)
Compute the value of the test statistic. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.) What is the p-value?
1) The life of a model of a wristwatch cell is 22 months with a standard deviation of 4 months and is approximately normally distributed. How many months should the manufacturer warantee the cell so
In the context of software development projects, a program manager was faced with the following choice last year: He had to option of going with a vendor who proposed a bid which was partly based on
Andrea, a self-employed individual, wishes to accumulate a retirement fund of $400,000. How much should she deposit each month into her retirement account, which pays interest at a rate of 3.5%/year
the compressive strength of samples of cement can be modeled by a normal distribution with a mean of 6000 kilograms per square centimeter and a standard deviation of 100 kilograms per square centime
The mean life of a particular brand of light bulb is 1000 hours and the standard deviation is 50 hours. Tests show that the life of the bulb is approximately normally distributed. It can be conclude
a. If we want to estimate the population mean time for previews at movie theaters with a margin of error of 75 seconds, what sample size should be used? Assume 95% confidence. b. If we want to estim
Tell if the following experiment is an example of a binomial experiment: A basketball player is going to attempt free throws until he gets a hit. The number of attempts until a hit is recorded.
A sample of Zach Johnson's drives shows that he successfully made the fairway in 40 out of 56 drives. Construct a hypothesis test to evaluate the claim that Zach's true (population parameter) propor
The thickness of a flange on an aircraft component is uniformly distributed between 0.95 and 1.05 millimeters.
How do you conduct a test for a hypothesis that two independent population means with known population standard deviations are equal?
The loss due to a flood is modeled by a random variable x with density function: f(x) = (48-x)/1152. Given that a loss exceeds 15 what is the probability it is less than 23?
It takes the bus an average of 20 minutes to arrive at a certain bus stop. A student is waiting for the next bus to arrive. a) What is the probability the student waits more than 30 minutes? b) What i
The airline wants to know what maximum total weight limit on passengers plus luggage it should choose so that 95% of flights will be under the limit. (Total weight refers to the sum of the weights o
According to the National Institute on Alcohol Abuse and Alcoholism (NIAAA), and the National Institutes of Health (NIH), 40.1% of college students nationwide engage in "binge drinking" behavior, ha
In a sample size of 27 hamburgers, the mean cost of the hamburgers was $9.36. Assuming that prices of hamburgers are normally distributed with a standard deviation of $0.26, find a 90% lower confide
A study of 40 professors showed that the average time they spent creating test questions was 16.5 minutes per question. The standard deviation of the population is 5.8.