Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Active Tutors
Asked Questions
Answered Questions
A researcher wishes to determine the number of days it takes an automobile dealer to sell a Chevrolet Aveo. A sample of 50 cars had a mean time one the dealer's lot of 54 days.
IN the sample, 46% of students had at least one parent who was college graduate. Determine with 99% confidence the proportion of all 17 year old students in 2008 who had a least one parent who was a
At the large department store, the average number of years of service was 13.5 with a standard deviation of 6.2 years. If an employee is picked at random, what is the probability that the employee
A poll stated that 32% of those polled think the economy is getting worse. An economist wanted to check this claim so she surveyed 750 people and found that 30% of them thought the economy is gettin
Estimates of the earths biomass, the total amount of vegetation held by earth, Assume a sample of 75 one-square-meter plots, randomly selected in North america produce mean biomass of 4.2 kilograms
For each of the following studies, say whether you would employ the t test for dependent means or a t test for independent means. Column preview
A manufacturer claims that the mean lifetime of the light bulbs he produces is at least 1200 hours. A random sample of 10 bulbs is taken and the lifetimes are observed. The results are summarized by
Assume that the drying time for certain kind of paint under specified test situations is known to be normally distributed with mean 75 minutes as well as standard deviation 5 minutes.
Assume for now that the company chooses the two employees to be fired at random, so all possible pairs of people have the same probability of being fired.
In a seismically active territory, earthquakes take place at an average rate of three per decade (one decade = 10 years) according to the Poisson process. Determine
Assume that past history describe that 60% of students prefer Brand C cola. A sample of 5 students is chosen. Determine the probability that at least three of the five students chosen will prefer br
Reconsider activities involving the sampling of Reese's Pieces candies. Continue to suppose that 45% of all Reese's Pieces are orange.
Suggest an experiment of drawing randomly three balls from urn containing two red, three white, and four blue balls. Let (X,Y) be bivariate random variable where X and Y denote, respectively, the nu
Assume that phone company reports that the average duration of a cell phone call is 1.7 minutes, with a standard deviation of 1.4 minutes.
For the most recent year available, the mean annual cost to attend the private university in the United States was $26,889. Suppose the distribution of annual costs follows the normal probability di
The SAT Reasoning Test (formerly called the Scholastic Aptitude Test) is perhaps the most widely used standardized test for college admissions in the United States.
Suppose you have a random of 10 people who would have been labeled as near-retirees in 2008. What is the probability that during 2008:
From: You randomly choose one card from standard deck. Event Bis selecting a ten of diamonds.
Would it be reasonable to employ a normal distribution to model the duration of cell phone calls? Explain, based primarily on the values reported above.
Now assume that 20 people each take random sample of 40 candies, compute the sample proportion of orange candies, and create a dotplot of their results.
A 15 sample collection had average of 3.84 and standard deviation of 3.07, while second collection of samples had a 1.49 average with an .8 standard deviation. Find out the 90% confidence interval f
Assume you toss the coin and put Uniform[0.4, 0.6] prior on theta, the probability of getting head on a single toss. If you toss the coin n times as well as obtain n heads, then Find out the posteri
The respone time for denver police to respond to emergency call is 8.4 minutes with the standard deviation of 1.7 Find the probibility that the responce time for a call is less than 5 minutes
We recruited study candidates from Greater Boston area using newspaper advertisements as well as television publicity" Is the sample a voluntary response sample? Why or Why not?
Suppose that women's heights are normally distributed with mean given =63.5 inches and standard deviation given=2.1inches.