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1. For a population that is normally distributed with a mean of 100 and standard deviation of 10, what value would separate the smallest 20% of values from the next larger 80% of values?
The density function for a series of processes is fX (x) = 3/2x^2 for ?1 < x < 1. Choose 10 numbers independently from this distribution and find P(at least one is more than .5)
An engineering department consists of15 electrical, 15 chemical, 15 industrial, and 15 civil engineers. An interdisciplinary task force of 10 people will be formed from this department.
Of 900 customers surveyed, 414 said they were very enthusiastic about a new home décor scheme. Construct a 99 percent confidence interval estimate of the population proportion. Interpret your
To help your restaurant marketing campaign target the right age levels, you want to find out if there is a statistically significant difference between the mean age of your customers and the age of
A researcher comuted the F ratio for a four-group experiement. The computed F is 4.86. The degrees of freedom are 3 for the numerator and 16 for the denominator
find the density, mean, and variance for X. find the reliability function for x. what is the reliability of these lights at 5000 miles? At 10,000 miles?
There chance of the condo not being able to withstand a major storm is .008 and because there is a storm every year, the condo will endure 25 storms during the mortgage. .008 * 25 = .2, meaning ther
If a normally distributed force having a mean of 180lb and standard deviation of 30 lb is applied, what is the static reliability? As the variability ( variance) of either the strength or load incre
For number 5 above, what is the mean and standard deviation for the distribution you have generated. Give units. Describe how the graph you generated for number 4 above would change if the probabilit
First use 2-month and then 3-month moving average method to forecast sales price. Using MAD approach, which average is better?
In a sample of 55 mice, a biologist found that 42% were able to run a maze in 30 seconds or less. Find the 90% limit for the population proportion of mice who can run a maze in 30 seconds or less.
Mean (µ ) of 250 screws and a standard deviation (? ) of 8.30. Find the probability that production will go below 238 screws.
What is the proberbility that the condo will incur major damage during Mr. Cane's 25-yr mortgage on the condo? If a reliability of 0.95 is desired, what is the condo's design life?
A brake assembly has been tested and found to have a capacity that is normally distributed with a a mean of 275 lb and a stadard deviation of 25lb. If a normally distributed force having a mean of 1
A survey was done and found that the best chocolate is dark chocolate. 29% of clients prefer dark chocolate. Stild Bakery conducted a sample of 100 clients who asked for chocolate.
Find a closed form for the moment generating function of a discrete uniform random variable, that is, for the random variable X with pmf p(x) = 1/n for x = 1,2,3,....,n.(hint: use lemma 2.6.1.)
Jasmine International has 100 prospective original bracelets. About 20% of all bracelets come to order for retailing. Suppose that the binomial assumptions are fulfilled and use a normal approximati
What is the value for x2left for a 95% confidence interval when n = 18?
A report states that 38% of home owners had a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 4% with 95% confidenc
A random sample of 100 voters found that 44% were going to vote for a certain candidate. Find the 99% limit for the population proportion of voters who will vote for that candidate.
These are a lot of airplanes that are coming in at a speed of six per minute during flights.
A) find the probability that at least 3 earthquakes occur during the next 2 weeks. B) find the probability distribution of the time, until the next earthquake.
Deyoung International Academy has students with the following grades: 10% had an A; 75% had a B; 10% had a C; and 5% had D's. In using these grades, answer these questions about a sample