Stats Library

Statistics Assignment Library

  1. Solved: The number of breakdowns per week for a type of minicomputer is a random variable $Y$ with a Poisson distribution and me
    The number of breakdowns per week for a type of minicomputer is a random variable $Y$ with a Poisson distribution and mean $\lambda$. A random sample $Y_1, Y_2, \cdots, Y_n$ of observations on the weekly number of breakdowns is available....
  2. Solved: 26. Movies on Phone Twenty-five percent of adults say they would watch streaming movies on their phone at work. You rand
    Movies on Phone Twenty-five percent of adults say they would watch streaming movies on their phone at work. You randomly select 12 adults and ask them if they would watch streaming movies on their phone at work. Find the probability...
  3. Solved: 4. A newspaper finds that the mean number of typographical errors per page is five. Find the probabi
    A newspaper finds that the mean number of typographical errors per page is five. Find the probability that a. exactly five typographical errors will be found on a page, b. fewer than five typographical errors will be found on a...
  4. Solved: In Exercises 5 and 6, use the following information. Basketball player Dwight Howard makes a free th
    In Exercises 5 and 6, use the following information. Basketball player Dwight Howard makes a free throw shot about 60.2% of the time. (Source: ESPN) Find the probability that the first free throw shot Dwight makes is the fourth shot....
  5. Solved: A very large batch of components has arrived at a distributor. The bat
    A very large batch of components has arrived at a distributor. The batch can be characterized as acceptable only if the proportion of defective components is at the most .06. The distributor decides to randomly select 7 components and to...
  6. Solved: NCAA Football Coach Salaries A simple random sample of 40 salaries of NCAA football coaches has a mean of \$ 415,953. As
    NCAA Football Coach Salaries A simple random sample of 40 salaries of NCAA football coaches has a mean of \$ 415,953. Assume that $\sigma=$ \$463,364. Find the best point estimate of the mean salary of all NCAA football coaches. Construct...
  7. Solved: The Cincinnati Enquirer reported that, in the United States, 66% of adults and 87% of youths ages 12 to 17 use the Inter
    The Cincinnati Enquirer reported that, in the United States, 66% of adults and 87% of youths ages 12 to 17 use the Internet (The Cincinnati Enquirer, February 7, 2006). Use the reported numbers as the population proportions and assume that...
  8. Solved: 1.83 The probabilities that a service station will pump gas into 0, 1, 2, 3, 4, or 5 or more cars during a certain 30-mi
    1.83 The probabilities that a service station will pump gas into 0, 1, 2, 3, 4, or 5 or more cars during a certain 30-minute period are 0.03, 0.18, 0.24, 0.28, 0.10, and 0.17, respectively. Find the probability that in...
  9. Solved: A telephone survey conducted by the Maritz Marketing Research company found that 43% of Americans expect to save more mo
    A telephone survey conducted by the Maritz Marketing Research company found that 43% of Americans expect to save more money next year than they saved last year. Forty-five percent of those surveyed plan to reduce debt next year. Of those...
  10. Solved: A brochure inviting subscriptions for a new diet program states that the participants are expected to lose over 22 pounds
    A brochure inviting subscriptions for a new diet program states that the participants are expected to lose over 22 pounds in five weeks. Suppose that, from the data of the five-week weight losses of 56 participants, the sample mean and...