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Chapter 8: Q. 9.16 (page 358)

Grey-Seal Nursing. Grey seals are one of several types of ear-less seals. The length of time that a female grey seal nurses her pup is studied by S. Twiss et al. in the article "Variation in Female Grey Seal (Halichoerus grypus) Reproductive Performance Correlates to Proactive-Reactive Behavioural Types" (PLOS ONE 7(11): e49598. doi:10.1371/journal.pone.0049598). The average lactation (nursing) period of all earless seals is 23 days. A hypothesis test is to be per formed to decide whether the mean lactation period of grey seals differs from 23 days.

Short Answer

Expert verified

Part (a). 23 days

Part (b). different from 23 days

Part (c). two tailed test

Step by step solution

01

Part (a) Step 1. Given information.  

All exclusively seals have a 23-day lactation (nursing) period on average. To determine whether the mean lactation period of grey seals differs from 23 days, a hypothesis test will be conducted.

02

Part (b) Step 1. Determine the alternative hypothesis.  

Alternative hypothesis

Ha:渭鈮�23

Grey seal lactation period differs average of 23 days.

03

Part (c) Step 1. Classify the hypothesis test as two tailed, left tailed, or right tailed. 

Because the not equal to sign appears in the alternative hypothesis in part (b), it is evident that the hypothesis test is two-tailed.

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Most popular questions from this chapter

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