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Draw a scatter plot for armspan and height (use the same scale on both axes). Describe the relationship between the two variables. Calcuate the correlation coefficient relating armspan and height
Those controller that fail the second test are reworked the second time and retested; 90% of them pass and the test are scrapped. Define Y to be the number of rework cycles for a randomly chosen con
A manufacturer of disk controllers subjects each new controllers to rigorous testing. Of newly assembled controllers, 84% pass the test with no rework. Controller that fail the initial test are rewo
The probability that a coin has to land Heads is unknown, say p, where p is some number in [0,1]. Let X be a random variable that takes the value 1 if the coin lands Heads and 0 if the coin lands T
The probability that a coin has to land Heads is unknown, say p, where p is some number in [0,1]. Let X be a random variable that takes the value 1 if the coin lands Heads and 0 if the coin lands Ta
Let Y be a random variable with a density function given by
Five cards are independently and randomly picked from a standard 52 card deck and each card is recorded in sequence. Each card that is picked is then put back in the deck, so it is possible to recor
Suppose a fair six-sided die is tossed and the outcome x recorded. Toss the die x more times and record the smallest number tossed, say y. Then toss the die y times again and record the largest numb
Suppose scores on a midterm and a ?nal exam have a bivariate normal distribution. The correlation between midterm scores and final exam scores is 0.6.
The distribution of IQ scores is a nonstandard normal distribution with a mean of 100 and a standard deviation of 15. What are the value of the mean and standard deviation after all IQ scores have b
A survey found that women's heights are normally distributed with mean 63.6 in and standard deviation 2.5 in. A branch of the military requires women's heights to be between 58 in and 80 in. Find t
Physicians want to select a minimum temperature for requiring further medical tests. What should that temperature be, if we want only 5.0% of healthy people to exceed it? (Such a result is a false p
Assume the readings on thermometers are normally distributed with a mean of 0*C and a standard deviation of 100*C. Find the probability P(-2.12<z<2.12), where z is in the reading in degrees.
What percent of the Ford Super Duty F-750s logged 65,200 miles or more? What percent of the trucks logged more than 57,060 but less than 58,280 miles? What percent of the Fords traveled 62,000 miles o
Write a brief scenario of a real world issue using a one-way analysis of variance (ANOVA) that includes clearly identified independent and dependent variables, the number of levels of the independen
Display the sampling distribution for the sample mean when sampling without replacement and use it to calculate the EV and standard deviation.
Assume the readings on thermometers are normally distributed with a mean 0*C and a standard deviation of 1.00*C. Find the probability that a randomly selected thermometer reads less than 0.14
A statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 49.0 and 59.0 minutes.
Find the probability that a given class period runs between 51.25 and 51.75 minutes.
A researcher has observed independent samples of females and males recording how long each person took to complete his or her shopping at a local mall. Using the .05 level of significance, would fem
Someone has a weighted coin that lands heads up with a probability of 2/3 andtails up with aprobability of 1/3. If the coin comes up heads you pay $1 dollar ; if the coin comes up tails you receive
In a city, 50% of people have Master cards, 60% have Visa cards, and 43% have both. What percentage of people have at least one of the two types of credit cards (Master, Visa)?
The probability that the student knows the answer is .80 and the probability that the student will guess is .20. Assume that if the student guesses, the probability of selecting the correct answer i
Steve Goodman, production foreman for the Florida gold Fruit Company, estimates that the average sale of oranges is 4,700 and the standard deviation is 500 oranges. Sales follow a normal distributio