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ST 260 Exam 3 Questions and Answers 2024
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ST 260 Exam 3 Questions and Answers 2024 Define Central Limit Theorem ** Answ** the sampling distribution of the mean is approximately normal no matter what the underlying distribution is as long as the sample size is large enough (n>=30) (T/F) If the underlying distribution of the v...

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  • August 28, 2024
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  • 2024/2025
  • Exam (elaborations)
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  • st 260 exam 3 questions and answers 2024

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  • Statistics | probability
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ST 260 Exam 3 Questions and Answers 2024


Define Central Limit Theorem ** Answ** the sampling distribution of the mean is
approximately normal no matter what the underlying distribution is as long as the sample size is
large enough (n>=30)


(T/F) If the underlying distribution of the variable of interest is normal, then we can assume that
the distribution of sample means is also normal, regardless of the sample size. ** Answ**
true


if you know the population standard deviation, you use which statistic? ** Answ** use z
table (standard deviation/ sq. root of sample size n)


if you do NOT know the population standard deviation, you use which statistic? ** Answ**
use t table (sample standard deviation/ sq. root of sample size n)


(T/F) as the level of confidence gets larger (95%, 99% etc) the width of the interval gets smaller
** Answ** false


level of confidence and width of interval are __________________ related ** Answ**
directly
**if you are more confident in a situation, the interval of the graph will be larger


sample size and confidence interval width are______________ related ** Answ** inversely
**a larger sample size has more people so you are less confident about the data


(T/F) the t distribution is essentially the same as the standard normal distribution at large (n>100)
sample sizes ** Answ** true

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