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Do the data provide sufficient evidence to point to that the diameters of ball-bearings produced by new procedure are more variable than those produced by old process? test at α=.01
There is a Box has 3 dimes and 4 quarters. you intent to choose three of these coins at random without replacement. Determine a random variable K as the total monetary value of three selected coins.
Failure in optical fibers employed in communications systems are typically due to a brittle fracture that grows in a complete crack, thereby disrupting transmission.
Failure in optical fibers used in communications systems are typically due to a brittle fracture that grows into a complete crack, thereby disrupting transmission.
A manufacturer is trying to decrease the defective rate of water filters employed in refrigerators. The current failure rate = 4%. In the new version the seal was changed; 300 filters were subjected
The local DNR biologists monitored harvested deer for bovine tuberculosis (BT), which requires an invasive sample of the harvested deer and is very time consuming.
Suppose that X, the fraction of a container that is filled, has pdf f(x;θ) = θxθ-1 for 0 < x < 1 (where θ > 0), and let X1,...,Xn be a random sample from this distri
An instructor gives his class a set of 12 problems with information that the next quiz will include a random selection of 3 of them. If a student has figured out how to do 8 of problems, determine t
Explain what a 90% confidence interval for the population mean is. Why must we assume that the null hypothesis is true in order to compute a p-value when doing a hypothesis test for the mean of a no
John has three pairs of socks, red, green, and blue. He decides to wear his favorite pair of blue socks today. But, his beloved wife is asleep and he doesn't want to wake her. So, he decides to sele
A study on students drinking habits wants to determine the true average number of alcoholic drinks all UF underclassmen students have in a one week period.
In 1990, the General Social Survey had question that asked its participants (that currently smoked) if they had ever tried to quit smoking. Out of 284, 211 said yes, they had tried to quit smoking.
For first seven months of the year, the average precipitation in Toledo, Ohio, is 19.32 inches. If average precipitation is normally distributed with standard deviation of 2.44 inches, find out thes
How many different sample of pilles are possibly when three pills are randomly chosen (without replacement from the 10 that are available? Determine the probability that all three of defective pills
In 1993, the General Social Survey had question that asked its participants (that currently smoked) if they had ever tried to quit smoking. Out of 288, 218 said yes, they had tried to quit smoking.
In 1993, the General Social Survey included question that asked its participants if they felt that nuclear power plants were extremely/very dangerous to environment. Out of the 1419 surveyed, 630 sa
One thousand Florida residents were asked if they would elect republican or democratic candidate for Governor in next election. 540 out of 1000 responded that they would vote for Democratic candidat
A random sample of n=12 of roses was chosen nad the length of roses measured resulting in these observations:
Using the estimation given above, estimate the sample size needed to determine the proportion of people who wants internet to in 0.02 with 95% confidence.
Based upon a sample size of 511 teens, it is estimated that the proportions of teens who support the legal drinking age at 21 is p=0.64. It is also reported that the margin of error of this estimate
Given the following frequency distribution, find the mean, variance, and standard deviation. Please show all of your work.
Three squares inches out of total area under frequency curve of 12 square inches falls below score of 68. If the curve is based upon a total of 80 cases, how many cases fall below score of 68?
Cars arriving for gasoline at the Shell station follow Poisson distribution with mean of 10 per hour. Calculate the probability that in the next 3 hours, more than 25 cars will arrive.
A frequency curve is constructed from test scores of 200 students. Sixty percent of total area under the curve falls between test scores of 25 and 45. How many students have scores between 25 and 45
The participants in a television quiz show are picked for a large pool of applicants with approximately equal numbers of men and women. Among the last 10 participants there have been only 2 women.