Statistics range rule of thumb confidence interval Suppose that

Coradossi7xod

Coradossi7xod

Answered question

2022-04-01

Statistics range rule of thumb confidence interval
Suppose that the minimum and maximum ages for typical textbooks currently used in college courses are 0 and 8 years. Use the range rule of thumb to estimate the standard deviation.
Standard deviation = I have gotten max - min/4
=804S
=2
Find the size of the sample required to estimage the mean age of textbooks currently used in college courses. Assume that you want 98% confidence that the sample mean is within 0.4 year of the population mean.
Required sample size =
I have no clue how to get the required sample size

Answer & Explanation

Mercedes Chang

Mercedes Chang

Beginner2022-04-02Added 15 answers

OK, now can apply Central Limit theorem if n is large enough. The thumb rule is n>30. We will see if it is the case. The width of the confidence interval is
X+z1α2sn(Xz1α2sn)=2z1α2sn
α is the significance level. Here it is 10.98=0.02
2z0.99sn=0.4
22.332n=0.4
n=22.3320.4

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