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Discuss the assumptions and limitations of the analysis of variance in comparison with the t test including a discussion of post hoc tests.
after a series of training sessions the restaurant determined the average waiting time was 86 min (s- 12 min) assume the population is normal. what % of patrons waited less than 90 min?
A major hurricane is a hurricane with wind speeds of 111 miles per hour or greater. During the 20th century, the mean number of major hurricanes to strike the U.S. mainland per year was about 0.7. F
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop. (b) Check the normality assumption. (c) Try the Very Quick Rule. Does it work well here?
10 percent of the customers of a mortgage company default on their payments. A sample of 9 customers is selected. What is the probability that exactly 2 customers in the sample will default on their
Compute the probability of a stock-out for the order quantities suggested by members of the management team.
A boy found a bicycle lock for which the combination was unknown. The correct combination is a four-digit number. The digits are selected from 1, 2, 3, 5, 6, and 7.
430 randomly selected light bulbs were tested in a laboratory, 224 lasted more than 500 hours. Find a point estimate of the proportion of all light bulbs that last more than 500 hours.
Homeowners claim that the mean speed of automobiles traveling on their street is greater than the speed limit of 35 miles per hour. A random sample of 100 automobiles has a mean speed of 36 miles pe
The best the physicians can guess is rhat there is a 50-50 chance the clinic will be successful. Construct a decision tree to help analyze this problem. What should be medical professionals do?
The standard deviation equaled five days. Assuming that the distribution is normal, what percent of the invoices were paid within 15 days of receipt?
a machine fille containers with a mean weight per container of 16.0 oz. If no more than 5% of the containers are to weigh less than 15.8 oz, what must the standard deviation ofd the weights equal?
(a). What assumptions must you make in order to use these statistics for inference? (b). Write a 90% confidence interval for the mean daily income this parking garage will generate.
The daily revenue totals for the next 30 days will be monitored. What is the probability that the mean daily revenue for the next 30 days will be between $7000 and $7500?
The lifetime of a disk drive head is normally distributed with a population mean of 1000 hours and a standard deviation of 120 hours. Determine the probability that the lifetime for 9 disk drives w
A hypohesis that people should follow a 24 hr. cycle of sleeping and waking even when they are not exposed to the usual pattern of sunlight. A study of eight volunteers were placed in a room by them
The life expectancy of computer terminals is normally distributed with a mean of 4 years and a standard deviation of 10 months. What percentage of terminals will last between 5 and 6 years?
The student body of a large university consists of 70% female students. A random sample of 6 students is selected. What is the probability that among the students in the sample exactly three are fem
A standard deviation of 12 what proportion of people have diastolic blood pressure less than 90. B. what proportion have diastolic pressure between 80 and 90.
Before 1918, approximately 58% of the wolves in the New Mexico and Arizona region were male, and 42% were female. However, cattle ranchers in this area have made a determined effort to exterminate w
The grades for the Statistics final exam of a large class are normally distributed with a mean of 42. Find the lowest score on the final exam that would qualify a student for a Grade A.
The lengths of a professor's classes has a continuous uniform distribution between 50.0 min and 52.0 min. If one such class is randomly selected, find the probability that the class length is less
A study of college football games shows that the number of holding penalties assessed has a mean of 2.3 penalties per game and a standard deviation of 1.05 penalties per game. What is the probabilit
5% of people in united states eligible to donate blood actually do. you randomly select 4 eligible blood donars and ask them if they donate blood. find the mean, variance and standard deviation of b
Does the random variable X have a binomial distribution or a Poisson distribution? Give reasons for your answer.