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Author Question: The mean attention span for adults in a certain village is 15 minutes with a standard deviation of ... (Read 92 times)

jayhills49

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on: Jun 19, 2018
The mean attention span for adults in a certain village is 15 minutes with a standard deviation of 6.4 . What is the probability of randomly selecting a sample of 30 scores from this population that has a mean attention span equal to or greater than 17 minutes?
 
  a. 0.3783 c. 0.0446
  b. 0.0436 d. 0.4564

Question 2

The mean attention span for adults in a certain village is 15 minutes with a standard deviation of 6.4 . If the means of all possible samples of size 30 is taken from this population, will equal _________.
 
  a. 3.0 c. 0.21
  b. 6.4 d. 1.17


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tofugiraffe

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Reply #1 on: Jun 19, 2018
Answer to Question 1

B

Answer to Question 2

D


jayhills49

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Reply 2 on: Jun 19, 2018
Excellent

miss.ashley

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Reply 3 on: Yesterday
Wow, this really help

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