A satellite photograph of an urban area was divided into 4x4 meter areas (called pixels). Of interest is a numerical measurement of the distribution of gaps or hole sizes in the pixel, called lacunarity. The mean and standard deviation of the lucanarity measurements of 900 pixels randomly selected from a specific urban area are 223 and 19, respectively. It is known that the mean lacunarity measurements for all grassland pixels is 218. Do the data suggest that the area sampled is grassland? Test at .05.
What is the value of the test statistic?
Z=
What is the rejection region?