Research at the SA weather centre in the Northern Cape recorded the number days the weather reached 38°C, first recorded in 1875. The numbers form a normal distribution with a mean of µ = 9.6 and a standard deviation of σ = 1.9. To see if the data showed any evidence of global warming, they also computed the average number of days (M = 12.25) the temperature reached 38°C, over the last 4 years. Do the data indicate that the past 4 years have had significantly more 38°C days that would be expected for any random sample from this population? Use a one tailed test with α = 0.05.

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Research at the SA weather centre in the Northern Cape recorded the number days the weather reached 38°C, first recorded in 1875. The numbers form a normal distribution with a mean of µ = 9.6 and a standard deviation of σ = 1.9. To see if the data showed any evidence of global warming, they also computed the average number of days (M = 12.25) the temperature reached 38°C, over the last 4 years. Do the data indicate that the past 4 years have had significantly more 38°C days that would be expected for any random sample from this population? Use a one tailed test with α = 0.05.

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