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What's on the worksheet
- A biologist studies brown anole lizards on two islands, each home to several thousand anoles (made-up data).
- A diver collects a random sample of 18 purple sea urchins at a kelp-forest site and an independent random sample of 22 at a bare-rock site a few…
- A camping store compares how long two brands of reusable cold packs stay below 5 degrees Celsius in a closed cooler (made-up data).
- A wildlife student weighs, in grams, a random sample of adult red squirrels caught in a pine forest and an independent random sample caught in an…
- A psychology class recruits 44 student volunteers and assigns 22 at random to take a 20 minute nap and the other 22 to sit quietly awake for 20…
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Interval for a difference of means: the lesson ›More Chapter 9 worksheets: Inference for means
- 9.1The t distribution and degrees of freedom
- 9.2Conditions for one mean
- 9.3One sample interval for a mean and sample size
- 9.4One sample test for a mean
- 9.5Interval for a difference of means
- 9.6Test for a difference of means
- 9.7Paired data: interval and test for a mean difference