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Author Question: Ten years ago, only 15 of the U.S. population consisted of people more than 65 years old. A ... (Read 128 times)

jake

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on: Jun 20, 2018
Ten years ago, only 15 of the U.S. population consisted of people more than 65 years old. A researcher plans to use a sample of n = 300 people to determine whether the population distribution has changed during the past ten years. If a chi-square test is used to evaluate the data, what is the expected frequency for the older-than-65 category?
 
  A) 15
  B) 30
  C) 45
  D) 150

Question 2

If one score is randomly selected from a normal distribution with  = 100 and  = 20, the probability of obtaining a score between X = 90 and X = 100 is p = 0.3085.
 
  Indicate whether the statement is true or false


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ladyjames123

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Reply #1 on: Jun 20, 2018
Answer to Question 1

C

Answer to Question 2

False


jake

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Reply #2 on: Jun 20, 2018
Thank you!


ladyjames123

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Reply #3 on: Jun 20, 2018
Happy to help


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