Module 17: Background You’ll Need 2

  • Calculate confidence intervals for a population mean using the [latex]t[/latex] Distribution

The [latex]t[/latex] Confidence Interval for a Population Mean

The conditions for the one-sample [latex]t[/latex] confidence interval are:

  • The sample is a random sample from the population of interest.
  • The sample size is at least [latex]30[/latex] or the population distribution is approximately normal.
Step 1: Choose the “Cell Phone Reaction Times” data set from the dropdown menu.
The data set consists of differences in reaction times (in milliseconds) recorded for a sample of people both when they were using cell phones and when they were not using cell phones.
Step 2: For “Type of Inference,” select “Confidence Interval” and set the confidence level to 95%.
Make sure that “Interval” is selected where it asks “Interval, Lower or Upper Bound?”


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