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Mary is deciding whether to book the cheaper flight home from college after her exams, but she's unsure when her last exam will be. she thinks there is a 30 percent chance the exam wil be scheduled
Carpetland salespersons average $8000 per week in sales Steve Contois, the firm's vice president, proposes a compensation plan with new selling incentives. Steve hopes that the results of a trial s
If the die is rolled a total of three times: a) Construct a table and histogram for the probability distribution of X. b) Find E(X).
A packet of sunflower seeds states that each seed will germinate with probability 0.7. A gardener randomly selects 6 seeds, plants them, and records whether or not each seed germinates. Define a ra
A box has three red balls and four green balls in it. A gambler bets $1 on red. A ball is randomly chosen. The gambler wins $1 if the ball is red, otherwise, he loses $1. He will play this game 200
Suppose IQ scores were obtained from randomly selected twins. For 20 such pairs of people, the linear corelation coefficient is 0.897 and the equation of the regression line is y(^)=7.54 + 1.07x, wh
State the hypothesis that can be used to test for a significant difference between the population proportions for the two years? What is the sample proportion indicating that their financial security
The accounting department analyzes the variance of the weekly unit costs reported by two production departments. A sample of 16 cost reports for each of the two departments shows cost variances of 2
A car manufacturer is concerned about poor customer satisfaction at one of its dealerships. The management decides to evaluate the satisfaction surveys of its next 66 customers.
A panel of meteorological and civil engineers studying emergency evacuation plans for Florida's Gulf Coast in the event of a hurricane has estimated that it would take between 13 and 18 hours to eva
A roll of plastic-coated wire has an average of 0.09 flaws per 5-meter length of wire. Suppose a quality control engineer will sample a 5-meter length of wire from a roll of wire 230 meters in lengt
The random variable X has a density function f(x) = 4xe^(-2x) if 0 < x < infinity , 0 otherwise
Which of the 95% confidence intervals below give you justification in thinking that your sample was drawn from a population with mean = 10?
We calculate a statistical power and find that it is 0.93. This means that if the null hypothesis is ________, we have a ________% chance of rejecting the null hypothesis.
Alex sells "Exciting World of Statistics" videos over the phone to earn some extra cash during the economic crsis. Only 10% of calls result in a sale. Assume that the outcome of each call is indepen
The roulette wheel has 38 compartments, of which 18 are red, 18 are black, and two are green. As the wheel is spun, a small metal ball bounces around until it settles in one of the compart- ments. I
If Xsub1,Xsub2,....Xsubn constitute a random sample from a population with the mean mu and the variance , use the methods of moments to find estimators for mu and variance.
When a health survey was conducted in some country. It found that 82 percent of the population was infected with a virus, 17 percent were without clean water and 15 percent were infected and without
A long-distance cyclist's back tire sometimes pops during long rides. because the cyclist knows that her tire has a tendency to pop, she carries a repair kit with her. Let X be the number
A computer chip manufacturer rejects 6 percent of the chips produced because they fail to work properly when tested. suppose the company tests 10 chips. What is the probability of the following resu
How do you create a histogram in excel when you have the following data on 40 best paid executives:
The purpose of an automobile timing belt is to provide a connection between the camshaft and the crankshaft. This allows the valves to open and close in sync with the pistons. Suppose the duration o
The International Tennis Federation (ITF) establishes the specifications for tennis balls. The diameter of a tennis ball used in any tournament must be between 2.5 and 2.625 inches. Suppose that the
What is the probability that the salinity is more than 35 ppt? What is the probability that the salinity is less than 33.5 ppt?
A tennis player makes a serve 72 percent of the time. suppose the player gets 80 serves in a match. What is the mean and standard deviation of the number of first good serves she makes?