a sociologist is dealing with a certain population with an unknown mean number of years of education and standards diviation of 2.25. he is testing the hypothesis that the population mean is 13.5 years, so she surveyed a sample of 100 residents. He decides to reject the null hypothesis when the mean is greater than or equal to 14 years.
Answers & Comments
The mean of a sample is not equal to 75.
Answer:
The mean, mode and median can be used to figure out if you have a positively or negatively skewed distribution. ... If the mean is greater than the median, the distribution is positively skewed. If the mean is less than the median, the distribution is negatively skewed.