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Two-Sample T-Test Assumptions The assumptions of the two-sample t-test are: The data are continuous (not discrete). The data follow the normal probability distribution. The two samples are independent. Both samples are simple random samples from their respective populations.
The conditions required to conduct a t-test include the measured values in ratio scale or interval scale, simple random extraction, homogeneity of variance, appropriate sample size, and normal distribution of data.
When to Use the t-Distribution? The sample size must be 30 or less than 30. The population standard deviation() is unknown. The population distribution must be unimodal and skewed.
10 Percent Condition: The sample is less than 10 percent of the population.
Properties of Sampling Distribution of Mean Unbiasedness: Mean of sampling distribution is equal to population mean. Efficiency: Sample mean come closure to population mean than any other unbiased estimator. Consistency: As sample size increases, variation of sample mean from population mean decreases.

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Conditioning on an event (such as a particular specification of a random variable) means that this event is treated as being known to have occurred. This still allows us to specify conditioning on an event {Y=y} where the actual value y is an algebraic variable that falls within some range.
The conditions required to conduct a t-test include the measured values in ratio scale or interval scale, simple random extraction, homogeneity of variance, appropriate sample size, and normal distribution of data.
The conditions we need for inference on a mean are: Random: A random sample or randomized experiment should be used to obtain the data. Normal: The sampling distribution of x ˉ \bar x xˉx, with, \bar, on top (the sample mean) needs to be approximately normal.
If the population is normal to begin with then the sample mean also has a normal distribution, regardless of the sample size. For samples of any size drawn from a normally distributed population, the sample mean is normally distributed, with mean X= and standard deviation X=/n, where n is the sample size.
Normal: The sampling distribution of p^​p, with, hat, on top needs to be approximately normal needs at least 10 expected successes and 10 expected failures. Independent: Individual observations need to be independent. If sampling without replacement, our sample size shouldnt be more than 10% of the population.

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