• Q : Poisson distribution with a mean....
    Basic Statistics :

    A high-volume printer produces minor print-quality errors on a test pattern of 1000 pages of text according to a Poisson distribution with a mean of 0.4 per page.

  • Q : Way to measure effect size....
    Basic Statistics :

    Several statistical tests have a way to measure effect size. What is this, and when might you want to use it in looking at results from these tests on job related data?

  • Q : According to poisson process with average rate....
    Basic Statistics :

    As Brian is leaving for college, his parents give him a car, but warn him that they would take the car away if he gets 6 speeding tickets. Suppose that Brian receives speeding tickets according to P

  • Q : Probability that the person was really authorized....
    Basic Statistics :

    If the alarm goes off and a person is refused admission, what is the probability that the person was really authorized?

  • Q : Appropriate hypotheses statements for example....
    Basic Statistics :

    What examples (professional, personal, social) can you provide on when we might use each type? What would be the appropriate hypotheses statements for each example?

  • Q : Percent confidence interval for the mean bill....
    Basic Statistics :

    A random sample of 12 lunch orders at Noodles and Company showed a mean bill of $12.99 with a standard deviation of $4.6. Find the 98 percent confidence interval for the mean bill of all lunch order

  • Q : Population will contract disease....
    Basic Statistics :

    Two diseases A and B are spread in a certain population. It is known that 10% of the persons in this population will contract disease A, 15% will contract disease B, and 3% persons will contract bot

  • Q : Reliable predictor of the data....
    Basic Statistics :

    If, in 2020, the actual number of Parrots observed turns out to be 1400, which model seems to be a more reliable predictor of the data? Explain how your know this.

  • Q : Sequence of rolls....
    Basic Statistics :

    You want to determine which kind of die you have, so you rol it 4 times, and get the following: 5,2,5,5, What is the probability of this sequence of rolls if H1 is true? What if H2 is true?

  • Q : T-statistic for data....
    Basic Statistics :

    In a recent study on gender differences in education, a sample of 7 boys had a mean score of 15.9 and a standard deviation of 4.1 on a Standardized Math Test. A sample of 11 girls had a mean score o

  • Q : Probability that none of the pete opponents....
    Basic Statistics :

    Let X be the number of teams from SD on Pete's season schedule. What's the probability that none of the Pete's opponents are from SD? What distribution and parameter(s) are you using?

  • Q : Stuffed animal instead of buying....
    Basic Statistics :

    Suppose that it costs $1 to play a game and the stuffed animal in the toy store costs $15. On average is it worthwhile for Lionel to play the crane machine game to get the stuffed animal instead of

  • Q : Find the interval that contains....
    Basic Statistics :

    The diameter of small Nerf balls manufactured at a factory in China is expected to be approximately normally distributed with a mean of 5.2 inches and a standard deviation of .08 inches. Suppose a r

  • Q : Percentile salary for male professors....
    Basic Statistics :

    If the standard deviation for the salaries of both genders is approximately $5200 and the salaries are normally distributed, find the 90th percentile salary for male professors and for female profes

  • Q : Probability that the student wears eye glasses....
    Basic Statistics :

    In a class, 20% of the students are male and 80% female. Among male students, 40% wears eye glasses; among female students, 30% wear eye glasses. If we select a student from the class at random, wha

  • Q : Expected number of trips....
    Basic Statistics :

    A grocery store is sponsoring a sales promotion where the cashiers give away one of the letters: a, e, l, s, u, v for each purchase. if the customer collects all six, he or she gets $20 worth of gro

  • Q : Fraction of the pints of blood....
    Basic Statistics :

    What fraction of the pints of blood used do you expect were contaminated? Derive your answer both intuitively and using the algebra of probabilities.

  • Q : Percent of the major surgery patients....
    Basic Statistics :

    According to a hospital administrator, historical records over the past 10 years have shown that 20 percent of the major surgery patients are dissatisfied with after-surgery care in the hospital.

  • Q : Describe the probaility mass function....
    Basic Statistics :

    If engines are randomly selected one at a time and tested, describe the Probaility Mass Function to use if we want to calculate the probaility that the first working engine will be found on the nth

  • Q : Probability of seven people in a household....
    Basic Statistics :

    What must be the probability of seven people in a household for this to be a legitimate discrete density? What is the probability that a randomly chosen household contains more than five people?

  • Q : Expected number of trips to a store....
    Basic Statistics :

    If the customer collects all six, he or she gets $20 worth of groceries free. What is the expected number of trips to a store a customer needs to make?

  • Q : Mean and variance of number of successful explorations....
    Basic Statistics :

    An oil exploration firm is formed with enough capital to finance ten explorations. the probability of a particular exploration being successful is .1. Assume the explorations are independent. Find t

  • Q : Correlation coefficient and coefficient of determination....
    Basic Statistics :

    If we increase the size of our sample, for ex. the pairs of data that we collect. Will this affect linear correlation coefficient and coefficient of determination? Please explain.

  • Q : Random variable for the failure of the screen....
    Basic Statistics :

    Let T be an exponential random variable for the failure of the screen for a television set, with a mean time to failure of 10,000 hours. If the set is operated an average of 6 hours per day:

  • Q : Calculate the probability that the series ends....
    Basic Statistics :

    Thus, it can end as early as the 4 th game (a "sweep") or as late as the 7 th game, with one team winning its fourth game after having lost three of the ?rst six games. Calculate the probability tha

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