The mean number of unprovoked shark attacks per year in the USA is 36.33, with a

Question

The mean number of unprovoked shark attacks per year in the USA is 36.33, with a standard deviation of 13.16 and is believed to be normally distributed. However, in the years 2000 and 2001, the mean number of unprovoked shark attacks was 54.5. Were the years 2000 and 2001 unusually dangerous for those who use the water for recreation? (Note that the sample size is two since there are two years.) This is a two part question 1.The test statistic for this hypothesis test should be Answer t = 1.95 z = 1.95 t = 1.38 z = 1.38 2.What is the critical value if alpha = 0.05? Answer z.05 = 1.645 z.05 = 1.960 t.05 = 6.314 t.05 = 12.706

Explanation / Answer

The mean number of unprovoked shark attacks per year in the USA is 36.33, with a standard deviation of 13.16 and is believed to be normally distributed. However, in the years 2000 and 2001, the mean number of unprovoked shark attacks was 54.5. Were the years 2000 and 2001 unusually dangerous for those who use the water for recreation? (Note that the sample size is two since there are two years.) This is a two part question 1.The test statistic for this hypothesis test should be Answer

t = 1.95 z = 1.95

t = 1.38 z = 1.38

2.What is the critical value if alpha = 0.05?

Answer

z.05 = 1.645

z.05 = 1.960

t.05 = 6.314

t.05 = 12.706

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