# Damage to grapes from bird predation is a serious problem for grape growers. The article Experimental Method

## Question:

a. Calculate an upper confidence bound for the true average time that blackbirds spend on a single visit at the experimental location.

b. Does it appear that true average time spent by blackbirds at the experimental location exceeds the true average time birds of this type spend at the natural location? Carry out a test of appropriate hypotheses.

c. Estimate the difference between the true average time blackbirds spend at the natural location and true average time that silvereyes spend at the natural location, and do so in a way that conveys information about reliability and precision.

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**Related Book For**

## Probability And Statistics For Engineering And The Sciences

**ISBN:** 9781305251809

9th Edition

**Authors:** Jay L. Devore