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System A because in shows more consistency in the measuring the average waiting time. System B because in shows more consistency in measuring the average waiting time. Either because their mean waitin
According to figures from us census bureau, the percentage of people under age 18 was 23.5% in new york city, 25.8% in Chicago, as well as 26.0% in LA. If one person is choosen at random from each c
At the local middle school, 60% of students are enrolled in choir or band. If the random sample of five students is taken, determine the probability that all five students are in choir or band?
GRE Scores at the Top-Ranked Engineering Schools/ The average quantitative GRE scores for top 30 graduate schools of engineering are listed. How to construct the grouped frequency distribution and
Suppose that the average annual salary for worker in the United States is $32,500 and that annual salaries for Americans are normally distributed with standard deviation equal to $6,250. Determine t
Many months later, we reran the turnover assessment on 30 random surveys as well as determined the turnover rate was 1.9 people per 2 weeks. Test as a large sample Z test, at the 1 tail test 0.05 a
A random sample of persons employed by the New hamsphire state authority established they earned an average wage of $75 per hour. The sample standard deviation was $6.50. How large a sample is neede
Compute the probability density function for random variable? Be sure to specific where this function takes the value 0. Employ your answer to part (a) to find out the probability that the minute han
Suppose that the following table gives the number of thousands of students in grades 9 through 12 for public schools in the U.S. Let X represent the grade level.
Compute a point estimate and a confidence interval for restaurant expenditure by people in the state whose food store expenditure is $5 billion.
Are events Face Card as well as Diamond independent events? Why or why not? Be sure to compute two appropriate probabilities before answering the two questions.
In a suburban area, past records revealed that 50 percent of all the high school graduates go to college. From 20 graduates selected at random, determine the probabililty that exactly 8 will go to c
The mean amount spent by a family of four on food per month is $500 with a standard deviation of $75. Supposing that the food costs are normally distributed, determine the probability that a family
Compute the difference between a standard error and a t-test?
An octave contains twelve distinct notes (on a piano, five black keys and seven white keys). How many different eight-note melodies within a single octave can be written if the black keys and white
It has been conjectured by the U.S. Census Bureau that "approximately 60% of the foreign-born people who live in U.S. are not naturalized citizens". Assume that in a national random sample of 70 for
Assume that the average full time college student in the U.S. requires a total of $10,500 per year to cover the costs of tuition, books and fees with a standard deviation of $1,300.
If a student from the survey is selected at random, then find out the probability that the student favors same sex marriages, given that student is not the Senior?
Out of the total of 10 college textbooks determine the standard deviation of their ages if the oldest textbook is known to be 7.9 years old and newest textbook is 1.3 years old.
What is the probability that the average age of these 40 airplanes is at least 14 years old? Round your answer to 4 decimal places. Remember to round your z-value to two decimal places.
A civil service exam yields scores with a mean of 81 and a standard deviation of 5.5. Using Chebyshev's Theorem what can we say about the percentage of scores that are above 92?
The percentage of foreign-born people who live in the U.S. and who are not naturalized citizens is overstated by the U.S. Census Bureau.
In a busy coffee shop, which is a member of an international chain of coffee shops, 40% of customers order a pastry in addition to their drink. If 20 customers were selected at random during one bus
To catch her flights from San Francisco she leaves her office one hour before her flight leaves. Her travel time from her office to the departing gate at the San Francisco airport, including the tim
If the level of confidence remains at 95% for the 720 confidence intervals in a given month, how many of the confidence intervals would you expect to fail to contain the value of µ and hence p