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An Accountemps survey of 150 executives showed that 44 out of them say that "little or no knowledge of the company" is the most common mistake made by candidates during job interviews (based on data
Hypothesis testing for population correlation coefficient and linear regression equation.Listed below are annual income (in thousands of dollars) and the amount of life insurance (in thousands of do
Find the standard normal score (Z-score). Your class took a test and the students earned the following scores.
Your friend is in a different section of the same subject. She also took a test and the class mean was 70 with a standard deviation of 2.3 points. Both you and your friend scored a 73. Comparatively
A manufacturing process has 78 percent yield, which means 78 percent of the products are acceptable. If six of the products are randomly selected (with replacement), find the likelihood that all are
Women have a mean height of 63.60 inches with a standard deviation of 2.50 inches. If the military wants to design equipment so that it fits 90 percent of the adult female population, what are the m
The weekly salaries of teachers in one state are usually distributed with the mean of $620 and a standard deviation of $65. What is the probability that a randomly selected teacher earns less than $
A final exam in Statistics has the mean of 75 with a standard deviation of 9.2. What is the possibility that a randomly selected student has a test score that is more than 85.
IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. What is the likelihood that a randomly selected student in our statistics class has an IQ between 85 and 95.
To qualify for police academy, candidates must score in the top 20 percent on a general ability test. The test has a mean of 300 and a standard deviation of 50. Find out the lowest possible score a
The mean lifetime of a TV by a certain manufacturer is 10.5 years with a standard deviation of 3 years. If the distribution is normal, for how many years should the manufacturer give a replacement g
If the average price of a new home is $400,000, find the maximum and minimum prices of the houses a contractor will build to include the middle 65 percent of the market. Presume a normal distributio
A survey of 460 voters in one state reveals that 315 favour approval of an issue before legislature. Construct the 90 percent confidence interval for the true population proportion of all voters in
Critical path method/ Program Review Technique using normal distribution.
Tom, a director of Management Resources, Inc., is in the procedure of designing a program that his customers can use in the job finding process. Some of the activities include preparing resume
A researcher wishes to estimate, with 95 percent confidence, the proportion of people who own a home computer. A previous study shows that 40% of those interviewed had a computer at home. Find the
A survey of 30 adults found that mean age of a person's primary vehicle is 5.6 years. Assume that the standard deviation of the population is 0.8 year, find a 99 percent confidence interval of the
How large a sample is essential if the teacher would like to be 98 percent confident that the estimate should be accurate within 1 year? From a previous study, the standard deviation of the ages is
The time it takes to assemble an electronic component is normally distributed with a mean of 17.2 minutes and a standard deviation of 3.1 minutes. The probability is 95% that it will take as a minim
Listed below are the winning times in seconds, of men in the 100-meter dash for consecutive summer Olympic Games, listed in order by row. Assume that these results are sample data randomly sel
The world's smallest mammal is the bumblebee bat, also known as the Kitti's hog-nosed bat. Such bats are roughly the size of a large bumblebee.
Construction linear regression equation.Refer to data set and use the weights of discarded plastic and the corresponding household sizes. Find out the best predicted household size given that househ
While is it important to have matched pairs rather than two independent sets of data.
A computer file of all smokers is compiled and they are all numbered consecutively, then a random numbers generated by computer are used to select a sample of 1000 smokers.
Given independent random variables X and Y with means and standard deviations as shown, find out the mean and the standard deviation of each of these variables.