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A random sample of six credit card accounts gave the following information about the payment due on each card:
The US Census Bureau announce that median sales price of new houses sold in April 2009 was $221,600 while the mean sales price was $274,300. Assume that the standard deviation of the prices is $90,0
If you made a histogram for this frequency table, what shape would the histogram have?
In a random sample 100 donors to President Obama, the average amount of donation was $500, with the population standard deviation being $60.
The US Census Bureau announce that the median sales price of new houses sold in April 2009 was $221,600 while the mean sales price was $274,300. Assume that the standard deviation of the prices is $
Assume we measure length of hospital stay (in days) for patients undergoing a particular surgical procedure. The mean is 3 days with a standard deviation of 3.2 days.
A trucking firm suspects that the variance for a certain tire is greater than 1,000,000. To check the claim, the firm puts 101 of these tires on its trucks and gets a standard devation of 1200 miles
Suppose you are working for a pharmaceutical company and are concerned about the amount of fluctuation in bottles of a particular cough syrup the company produces.
A major car manufacturer wants to test a new engine to determine whether it meets new air pollution standards. The mean emission,? of all engines of this type must be less than 20 parts per million
At a significance level of 0.04, is there a reson to believe that the proportion of voters supporting Obama has changes?
Assume X is a binomial random variable with n = 100 and p = 0.1, find
The random variable X is uniformly distributed from -1 to 0, and the random variable Y is uniformly distributed from -1 to 1. X and Y are statistically independent. Determine the probability density
A student should answer 43 or more questions correctly to obtain a grade of A. What percentage of the students who have done their homework and attended lectures will obtain a grade of A on this mu
Two registers in the microprocessor are read at random times which are statistically independent. Each register is read once. If the time at which each register is read is uniformly distributed from
A sample of 15 pairs of X and Y values produces a correlation of +0.47. For alpha = 0.05 (two-tailed) can we conclude that there is a non-zero correlation between X and Y in the population? Why/why
How large a sample is needed to estimate the proportion of undecided voters in the presidential elections if you wish this proportion to be within 0.032, using a confidence level of 0.97, in the mos
In a random sample of 50 customers out of 400 customers, the average amount spent on groceries was $65.60. Assuming a population standard deviation of $8.50, set up a 90 percent confidence interval
An investigator hypothesizes which cholesterol levels in children might be affected by educating their parents on proper nutrition and exercise.
Recent recommendations suggest 60 minutes of physical activity per day. A sample of 50 adults in a study of cardiovascular risk factors report exercising a mean of 38 minutes per day with a standard
A well-designed and safe workplace environment can contribute greatly to raised productivity. It is especially significant that workers not be asked to lift objects that are to heavy. Assume a resea
A random sample of 250 credit card holders shows that the mean annual credit card debt for individual accounts is $1592, with a standard deviation of $997. Construct a 94% confidence interval for th
In the study of physical attractiveveness and mental disorders, 231 subjects were rated for attractiveness, and the resulting sample mean and standard deviation are 3.94 and 0.75, respectively.Cons
We wish to estimate the mean gestational age (in days) in high risk pregnancies. If we sample 50 high risk pregnancies, and if the standard deviation in 4 days, what is the probability that the poin
Suppose we measure length of hospital stay (in days) for patients undergoing a particular surgical procedure. The mean is 3 days with a standard deviation of 3.2 days.
Assume that the magnitude of a signal received from a satellite is S=a+bV+W where V is a voltage which the satellite is measuring, a and b are constant, and W is a noise term. Suppose V and W are in