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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
70% of all interns give up their jobs in their first 2 weeks of employment. A group hires 6 interns, which can be viewed as a random sample.
Do the null hypotheses differ between a regression versus at t-test analysis;if so, how? If not, why : could u explain using some example for both cases.
A batch of 20 employed automobile alternators contains four defectives. If three alternators are sampled at random, find out the probability of the event.
In how many of the pairs will 0 or 1 person not be capable to do the work? If two persons are selected in a random manner, what is the probability that neither will be capable to do the job?
Of 20 rats in a cage, 12 are males and 9 are infected with a virus that causes hemorrhagic fever. Of the 12 male rats, 7 are infected with the virus. One rat is randomly choosen from the cage.
In a shipment of 12 room air conditioners, there are 3 with defective thermostats. Three air conditioners will be selected at random and inspected one after another. Find the probability that: