SOCR Courses 2011 2012 Stat13 1 Lab3

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Stats 13.1 - Laboratory Activity 3

You can access the applet for any of the SOCR distributions (http://www.socr.ucla.edu/htmls/SOCR_Distributions.html). Use SOCR to graph the following distributions and answer the questions below.

Binomial Distribution Activity

Problem 1

  • X ~ Binom(10, .5)
  • Find: P(X = 3), E(X), sd(X) from the SOCR output, and verify them with the formulas discussed in class.

Problem 2

  • X ~ Binom(10, .1)
  • Find and verify:
  • P(1 <= X <= 3)
  • P(1 \leq X \leq 3)

Problem 3

  • X ~ Binom(10, .9)
  • Find and verify:
  • P(5 < x < 8)
  • P(x < 8)
  • P(x <= 7)
  • P(x >= 9)

Problem 4

  • X ~ Binom(30, .1)
  • Find and verify: P(x > 2)

Distribution Comparison

  • Graph and comment on the shape of the binomial distribution with n = 30, p = 0.1 and then with n = 20,p = 0.9 (take a snapshot of each).
  • Now, keep n = 30 but change p = 0.45. How about when n = 100, p = 0.1? Take another snapshot.
  • What changes do you observe in the distribution as the parameters change? Write brief statements in this chart.


Smaller n Larger n Smaller p Larger p









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