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Author Question: In situations involving two or more variables, both histograms and bar charts can be used for ... (Read 21 times)

tichca

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on: Jun 24, 2018
In situations involving two or more variables, both histograms and bar charts can be used for multiple variables on the same graph.
 
  Indicate whether the statement is true or false

Question 2

A cell phone service provider has selected a random sample of 20 of its customers in an effort to estimate the mean number of minutes used per day.
 
  The results of the sample included a sample mean of 34.5 minutes and a sample standard deviation equal to 11.5 minutes. Based on this information, and using a 95 percent confidence level:
  A) the critical value is z = 1.96
  B) the critical value is z = 1.645
  C) the critical value is t = 2.093
  D) The critical value can't be determined without knowing the margin of error.


sylvia

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Reply #1 on: Jun 24, 2018
Answer to Question 1

FALSE

Answer to Question 2

C


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