μX = the mean of X
σX = the standard deviation of X
𝑥¯ ~ N**(𝜇𝑥, 𝜎𝑋 / 𝑛√)** = If you draw random samples of size n, then as n increases, the random variable 𝑥 which consists of sample means, tends to be normally distributed
sampling distribution of the mean: approaches a normal distribution as n, the sample size, increases.
The random variable 𝑥¯ has a different z-score associated with it from that of the random variable X. The mean 𝑥¯ is the value of 𝑥¯ in one sample.
μX = the average of both X and x¯
Standard error of the mean: 𝜎𝑥 = 𝜎𝑋 / √𝑛 =standard deviation of x¯
Probabilities for means on the calculator
Percentiles for means on the calculator
The central limit theorem for sums: As sample sizes increase, the distribution of means more closely follows the normal distribution.
The normal distribution: has a mean equal to the original mean multiplied by the sample size and a standard deviation equal to the original standard deviation multiplied by the square root of the sample size**.**
The random variable ΣX has the following z-score associated with it:
Probabilities for sums on the calculator
Percentiles for sums on the calculator
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