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Author Question: Simple random sampling has been used to obtain a sample of 81 elements from a population of size 500 ... (Read 96 times)

bio_gurl

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on: Jun 24, 2018
Simple random sampling has been used to obtain a sample of 81 elements from a population of size 500 . The sample mean is 120, and the sample standard deviation is determined to be 36.
 a. Estimate the standard error of the mean.
  b. Develop an approximate 95 confidence interval for the population mean.
  c. Estimate the population total.
  d. Develop an approximate 95 confidence interval for the population total.

Question 2

According to the Empirical Rule, if the data form a bell shaped normal distribution approximately ___________________ _ percent of the observations will be contained within 3 standard deviations around the mean.
 Fill in the blank(s) with correct word


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heyhey123

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

a. 3.7 (rounded)
b. 112.68 to 127.32
c. 60,000
d. 56,338.3 to 63,661.7

Answer to Question 2

99.7


bio_gurl

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Reply #2 on: Jun 24, 2018
Correct answers!


heyhey123

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Reply #3 on: Jun 24, 2018
Great! Please up vote :D


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