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The following data give the 1994 total area of farmland (in millions of acres) for 10 states (Statistical Abstract of the United States, 1995). The data, entered in that order, are for the states o
At one high school, the average amount of time tenth-graders spend watching television each week is 21.6 The principal introduces a campaign to encourage the students to watch less television. One y
A production process is set to manufacture bolts with a diameter of 0.5 inches. If production is meeting these standards, and you take a sample and the sample mean is .49 inches, what is the samplin
Show how the standard error was determined. Interpret the confidence interval. Based on these results, explain the distribution of the data.
The mean of the 60 heights is 63.4 in and the mean of the 60 pulse rates is 73.9 beats per minute. Find the best predicted pulse rate of a woman who is 66 inches tall. Use a significance level of a=
When the variances of the population distribution and the sampling distribution of means are compared the
A production process is set to manufacture bolts with a diameter of 0.5 inches. The process has a standard deviation of 0.005 inches. If production is meeting these standards, what is the probabilit
When a population mean is compared to to the mean of all possible sample means of size 25, the two means are
The data show the bug chirps per minute at different temperatures. Find the regression equation, letting the first variable be the independent (x) variable.Find the best predicted temperature for a
A population's distribution is normal with a mean of 20 and a standard deviation of 5. A sample of 16 observations is selected and a sample mean computed. What is the probability that the sample mea
If you wish to estimate a population mean and have estimate be between +/- of the true value and you wish to have a confidence level of 99%., what sample size will be required if the population stan
If a set of grades on a statistics examination is approximately normally distributed with mean of 74 and a standard deviation of 7.9, find the lowest passing grade if the lowest 10% of the students
Check the conditions of inference. Calculate the test statistic, show work. Give the appropriate p-value and state whether it is one-sided or two-sided.
1) A legislative committee consists of 13 democrats, 7 republicans, and 3 independents. A delegation of 3 is selected to attend an environmental summit.
When circuit boards used in the manufacture of compact disc players are tested, the long-run percentage of defectives is 5%. Let X = the number of defective boards in a random sample of size n = 25
At least 6 of the calls involve a fax message? More than 6 of the calls involve a fax message? What is the expected number of calls among the 25 that involve a fax message?
Flights on a certain route are on time 85% of the time. Suppose 9 flights are randomly selected and the number of on time fligghts is recorded. Use technology to find the probabilities. Determine w
In the binomial probability distribution, let the number of trials be n = 3, and let the probability of success be p = 0.4471. Use a calculator to compute the following.
Houses with and without air conditioners on nine different streets in a certain city are shown below. Test (at the 5% level) the null hypothesis that having an air conditioner is independent of stre
A student observes the elevator usage of a building with a single elevator. This elevator will only allow people to go from the main floor to the 10th of the building.
Select a company (maybe your employer) and assess how it uses data in marketing its products or services. (If it is not your employer, find a sizable local company or search the Internet for a compa
A building is designed to resist loading from earthquakes. The capacity (in terms of force factor) is assumed to follow a lognormal distribution with a median of 6.5 and a standard deviation of 1.5.
Construct a confidence interval of the population proportion at the given level of confidence X= 540, N = 1200, 90% confidence
Sixty people will board a regional jet. The mean weight of the population is 150 pounds with a standard deviation of 30 pounds. Calculate the approximate probablility that the mean weight of 60 pass
An electronic product contains 25 integrated circuits. The probability that any integrated circuit is defective is 0.01 and the integrated circuits work independently. Suppose that X denotes the num