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5 Questions of Basic Statistics | Practice Exam 2 | MS 204, Exams of Statistics

Jacksonville State University (JSU)Statistics
Prof. Janice L. Case

Material Type: Exam; Professor: Case; Class: Basic Statistics; Subject: Mathematics (MS); University: Jacksonville State University; Term: Unknown 1989;

Typology: Exams

Pre 2010

Uploaded on 08/18/2009

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koofers-user-yw6 🇺🇸

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MS 204 Statistics Practice Test 2 Chapter 4
1. Consider the following discrete probability distribution for X.
X 036912
P(X
)
.
1
.
1
.
1
.
2
.5
a. Sketch a probability histogram. What is the shape of the distribution?
[8 points]
b. Find the mean of the distribution.
[8 points]
c. Find the standard deviation of the distribution.
[8 points]
pf3
pf4

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MS 204 Statistics Practice Test 2 Chapter 4

  1. Consider the following discrete probability distribution for X. X 0 3 6 9 12 P(X )

a. Sketch a probability histogram. What is the shape of the distribution? [8 points] b. Find the mean of the distribution. [8 points] c. Find the standard deviation of the distribution. [8 points]

  1. The following Minitab graph represents a binomial probability distribution. [8 points] n = __________ p = __________ 0 5 10 15 20 25
  2. 2
  3. 1
  4. 0 x p( x)
  5. An article in USA Today stated that “Internal surveys paid for by directory assistance providers show that even the most accurate companies give out wrong numbers 15% of the time.” Assume that you are testing such a provider by making 10 requests. If success is defined as “giving out a wrong number”, then this situation can be modeled using the binomial distribution. [5 points each] a. Identify n and p. b. Based on the Minitab lab and your value of p, what is the shape of the graph of this distribution? c. Describe the random variable, x, in the context of the problem

d) What percent of the data falls within 2 standard deviations of the mean?

  1. The Central Limit Theorem describes the behavior of samples drawn from any population. What does the Theorem say concerning mean, standard deviation, and shape of the sampling distribution? [5 points]