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A certain printer cartridge has demonstrated a mean time usage of 9 hours and a standard deviation of 22 minutes. What time usage guarantee (in hours) should the manufacturer advertise in order to e
If 25 quarters are randomly selected calculate an interval that will include 95% of all the mean weights of randomly selected samples of quarters of size 25.
The average amount of debt families have is 2.5 times their annual income with a standard deviation 0.75 times their annual income. How much debt does a family have to have (relative to their annual
A statistics instructor collected data on the time it takes the students to complete a test. The test taking time is uniformly distributed within a range of 35 minutes to 55 minutes.
Suppose that an individual stock's return is normally distributed with a mean of 10% and a standard deviation of 8%. What is the probability that the stock's return will be at least 16%? (please rou
If the board wants to set the passing score so that only the best 80% of all applicants pass, what is the passing score? Assume that the scores are normally distributed.
A stock analyst assigns the following probability distribution to the possible earnings per share (eps) of a company: he believes there is a probability of 0.29 that eps will be 1.04, a probability
Use Chebyshev's theorem to find what percent of the values will fall between 120 and 150 for a data set with mean of 135 and standard deviation of 7.5.
If 55 people are chosen at random, what is the probability that the sample mean of IQ scores will not differ from the population mean by more than 2 points?
There were many car accidents following the snow in Little Rock on Jan. 6. An insurance company who offers automobile insurance had the following number of claims for the following amounts: 21 claim
How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 0.04 with 98% confidence?
A researcher demonstrated a correlation of .60 between teacher attire and student academic performance across 150 grade schools in her state. She concluded that encouraging teachers to be properly a
A sample of 81 business managers on the West Coast had an average breakfast cost of $7.65. Find the P-value for the test.
Find a 95 percent confidence interval for the true proportion of all current Bank of America customers who would respond with a 9 or 10. Are we 95 percent confident that this proportion exceeds .48,
Find a 95% confidence interval estimate of the average salary for all chemists at the Dull Chemical Company.
(a) How many independent network servers would be needed if each has 99 percent reliability? (b) If each has 90 percent reliability?
The manager of a paint supply store wants to determine if the mean amount of paint contained in 1- gallon cans purchased from a nationally known manufacturer is actually less than 1-gallon. It is k
Seven employees were included from Area A, 9 from Area B and 12 from Area C. The test statistic was computed to be 4.91. What can we conclude at the 0.05 level?
A population of scores forms a normal distribution with a mean of 40 and a standard deviation of 12.
The probability that 0, 1, 2, 3 or 4 people will seek treatment for the flu during any given hour at any given. What are the variance and standard deviation of X?
Compute the z-score for M=89 for a sample of n=25 scores. Is this sample mean in the middle 95% of the distribution?
A marketing research company needs to estimate which of two soft drinks college students prefer. A random sample of n college students produced the following 98% confidence interval for the proporti
Create a linear model to estimate the number of points students will score on the next exam from the number of hours the student studies.
At α=0.05, can you reject the auto maker's claim that the mean gas mileage of its sports utility vehicle is 20 miles per gallon? Assume the population is normally distributed.