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Let X denote th roportion of allotted time that a randomly selected student spends working on a particular aptitude test, and suppose the probability density fuction, p(x) of X is: {f(x)= (theta + 1
Give an example of population members that will be omitted in the following situation. There is a population of all 250 students in your large statistics class. You plan to obtain a simple ran
The population standard deviation is 800 miles. if you select one tire, what is the probability that its life span is less than 48,500 miles?
Determine the proportion of homes that have a pool. At the .05 significance level, can we conclude that less than 40 percent of the homes sold in the Denver area had a pool? What is the p-value?"
Macaray Homes is developing two parcels near Globe Arizona. In order to test different advertising approaches, they use different media to reach potential buyers.
The supermarket is open 17 hours per day. What is the probability that the total number of customers who enter the supermarket in one day is greater than 11700?
What is the probability that 8 or more were male? What is the probability that 8 or more were female? What is the probability that fewer than 5 were female?
bank uses a score system to estimate credibility for every person applying for a loan. results are normally distributed with mean 200 and standard deviation 50. find probability that a single score
The Big Triple at the local racetrack consists of picking the correct order of finish of the first three horses in the ninth race. If there are 12 horses entered in today's ninth race, how many Big
A random sample of 144 observations has a mean of 20, a median of 21, and a mode of 22. The population standard deviation is known to equal 4.8. what is the 95.44% confidence interval for the popula
Out of 1000 randomly selected people at the DMV, about how many would be expected to have to wait i) between 26.4 and 32.8 minutes? ii) longer than 39.2 minutes.
An auditor samples 100 of a firm level vouchers to ascertain what percentage of the whole set of voucher are improperly documented. what is the approximate probability that more than 30% of the samp
Describe how the confidence intervals will change depending on whether the population standard deviation is known or unknown.
A random sample of 81 automobiles traveling on a section of an interstate showed an average speed of 60 mph. The distribution of speeds of all cars on this section of highway is normally distributed
Who misses work more often at the ABC Company: Smokers or non-smokers? Test at .05 significance level.
What is the probability that none of three randomly selected persons is allergic to this drug? Assume that all three persons are independent.
A sample of 26 elements from a normally distributed population is selected. The sample mean is 10 with a standard deviation of 4. what is the 95% confidence interval for m ?
An automatic machine that fills bags of unpopped popcorn is operating properly if the weights are independently and normally distributed with a mean of 113 grams and a standard deviation of 5.4 gram
what the 98% confidence interval for the average age of all students at this college is ?
Is there evidence that the population mean amount is different from 25.3 hours? Determine the p-value and interpret its meaning.
If it is desired that the probability of a smaller clearance (i.e., x1 - x2) than 0.09 should be 0.006, what distance between the nominal dimensions of the two parts (i.e., u1 and u2) should be spec
A random sample of 25 statistics examinations was taken. The average score in the sample was 76 with a variance of 144. Assuming the scores are normally distributed, what the 99% confidence interval
A quality control analyst randomly selects 3 different car ignition systems from a manufacturing process that has just producted 200 systems, including 5 that are defective.
Assume that the variable B is the number of years of experience. Suppose the person has 2 years of college and 7 years of experience. What should their salary be?
A random sample of 25 observations was taken from a normally distributed population. The average in the sample was 84.6 with a variance of 400. Construct a 90% confidence interval for m.