T-test

Single-sample t-test & Confidence Interval – Excel & StatCrunch

When we do not know the population standard deviation sigma, σ, and the sample size, n, is less than 30, we use the t-test to evaluate a claim. Consider the following problem: A scientist thinks the mean waste recycled by adults in the US is now more than one pound per person per day. In …

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Recognizing problem types: Hypothesis tests

Read the problem looking for keywords and values: What type of variable is the focus of the problem? Is it quantitative, e.g. a mean, or categorical, e.g. a proportion or percent? How many variables are of concern? Is(are) the population(s) standard deviation, sigma, given? Are sample variances equal or are you instructed to assume they …

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