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Sagot :
To answer this question you must identify the following
Population mean: 160 important for hypothesis testing
Sample size = 25
Sample mean =183
Sample SD = 12
First find the Z score given the following (183-160)/12 or (sample mean -pop mean)/SD
Then using the z score 1.916 on the z score chart we see it corresponds to about 0.9719 which we know holds the values from 0-160. We want to know greater than 160 so we subtract it from 1.
1-0.9719 = 0.0281 which is less then the alpha of 0.05.
So we can reject the null hypothesis because it is significantly significant. Which gives us C
Population mean: 160 important for hypothesis testing
Sample size = 25
Sample mean =183
Sample SD = 12
First find the Z score given the following (183-160)/12 or (sample mean -pop mean)/SD
Then using the z score 1.916 on the z score chart we see it corresponds to about 0.9719 which we know holds the values from 0-160. We want to know greater than 160 so we subtract it from 1.
1-0.9719 = 0.0281 which is less then the alpha of 0.05.
So we can reject the null hypothesis because it is significantly significant. Which gives us C
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