The Greenland ice sheet covers roughly 80 of the surface of

The Greenland ice sheet covers roughly 80% of the surface of Greenland, being the second largest body of ice in the world, after the Antarctic ice sheet. As the arctic climate is rapidly warming, the Greenland ice sheet has experienced record melting in the recent years. The following data gives the depth of the ice sheet (in m) measured at various locations during the summer months in the Northeast greenland National Park:

3115, 3133, 3123, 3145, 3125, 3131, 3127, 3120, 3118, 3124

Solution

Data : 3115, 3133, 3123, 3145, 3125, 3131, 3127, 3120, 3118, 3124

n=10

Sample Mean (X-bar) = 3126.1

Sample Standard Deviation = 8.63391

Mean mu = 3140

t = (X-bar - mu )/(SD/sqrt(n))

= (3126.1 - 3140) / (8.63391/sqrt(10))

= -5.091

dF = 10-1 =9

Therefore,

P-value = 0.000326

Since,

P-value < 0.05

Reject the null hypothesis.