40 out of 85 cubs were male, while 15 out of 45 adult bears were male. Use a two

Question

40 out of 85 cubs were male, while 15 out of 45 adult bears were male. Use a two-sample Z-test to determine if these data provide sufficient evidence to conclude that the proportion of males is lower in the adult age class than in the cub age class (indicating higher mortality rates for male than female grizzly bears).

State appropriate H0 and Ha .
H0: ____________ Ha : ____________

Compute the pooled estimate of the proportion of males in the cub and adult age

classes combined and compute the standard error of the difference c - a , S ( c - a), assuming the Null hypothesis is true.

Describe the sampling distribution

of( c - a)underthepremisethat the Null hypothesis is true. Shade the area under the curve that corresponds to the p-value associated with the observed

difference c - a .

E( c- a) = _________ S( c- a) = _________ Shape = _________

d. Compute the Ztest statistic and determine the p-value of the test statistic.

e. Interpret the meaning of this p-value in the context of this study, using terms understandable to someone who has not studied statistics.

f. State your conclusion with regard to the original question.

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Rajeswari R answered this 17 minutes laterEdit   Delete

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