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The time taken by china HU Company to construct a small bridge is normally distributed with a mean of 400 labour hours and a standard deviation of 100 labour hours. What is the probability that the
A student passes the test if his/her grade is larger than or equal the passing grade. What score should she set as the lowest passing grade?
suppose we have a population with the mean of 100 and a standard deviation of 28.We take repeated samples of size 49 and calculate the mean of each sample to form a sampling distribution
What is the probability of her making 97 or more free throws in 118 trials? Round your standard normal variable to two decimal places before using the table of values.
an airline measures that 90% of people booked on their flights actually show up. if the airline books 71 people on a flight for which the maximum number is 69, what is the probability that the numbe
The probability of his passing english is 0.8, but the probability of his passing both is 0.6. What should be his estimate of the probability of his passing math?
A process produces items that are classified as either acceptable or defective. When the process is stable, the proportion of defective items is 0.2. Construct 3-sigma control limits for the proport
If a random sample of 4 fully grown maple trees is selected from the population, find the probability that the mean height of the maple trees is between 85 and 90 feet.
95% of the washers produced have a diameter between 26 and 74 micrometers, with a mean of 50. Assuming the process is stable, construct a 95% confidence interval for the average diameter of the next
calculate a 95% confidence interval to estimate the population proportion of all residents who support casinos.
The length of widgets produced on an assembly line has an upper specification limit of 80 mm and a lower specification limit of 20 mm. The process mean is 50 mm and the variance is 16. Construct a 9
Consider the data that was obtained from a random sample of 45 credit card accounts. Identify all the averages (mean, median, or mode) that can be used to summarize the outstanding balance on each
Assume that the process is stable and that the weights are normally distributed. What is the probability that the next widget produced will weigh more than 60 g?
The weight of widgets produced on an assembly line has an upper specification limit of 70 grams (g) and a lower specification limit of 30 g. When the process is stable, 95% of the widgets produced w
Four percent of hair dryers produced in a certain plant are defective. Estimate the probability that of 9,000 randomly selected hair dryers @ least 300 are defective.
Calculate a two-way ANOVA for the following situation. What are the independent variables, and what are the dependent variables? What would be an appropriate null hypothesis?
A product has an upper specification limit of 82 and a lower specification limit of 10. The process variance is 4. What is the process capability index (Cp)?
Assume that the process is stable and that the weights are normally distributed. Determine 3-sigma lower and upper control limits for a subgroup size of one.
To carry out this test, you obtain a random sample of size 150 from this population. This sample yields a mean of 1.80 and a standard deviation of 1.30. What are the appropriate null and alternative
If you purchase one of the flashights in this shipment, find the probability that it has the following: a defective bulb or a defective battery.
If the 50,000 children were a random sample from the population of children represented by past records, what is the probability of observing a value of x equal to 60 or more?
A farmer wants to try a new experimental diet on his hogs. He wants to be 95% confident that the average weight gain will be within 9 pounds. If the standard deviation is 20 pounds, and the weight g
Given a word problem or case study, and an accompanying data set which addresses a business situation such as daily demand or monthly sales, calculate numerical summaries including measures of centr
The principal randomly selected six students to take and aptitude test. Their scores were: 83.0 84.1 83.5 83.7 84.1 73.5 Determin a 90 percent confidence intercal for th mean score for all students
What are the characteristics of a normal distribution? Why is the normal distribution important in statistical analysis? What is the Standard Normal Distribution? Can you think of a variable that i