Two Tail Hypothesis Scholarship Essay Example | Topics and Well Written Essays - 500 words

Two Tail Hypothesis - Scholarship Essay Example The analysis can be used by the manager to study if there is the significant difference between position and extrinsic job satisfaction in the company. This would enable the manager to make a plan on which strategy to use either Hourly Employee or Salaried Employee in respect of job satisfaction. Since ÃŽ ±=0.05 and confidence level is 95%; t- statistic=-54.60, the critical value is  ±1.96 we reject null hypothesis because p-value 1.67 E-91 is less than 0.05 and adopt alternative hypothesis. The t-test is used when the sample is small; it can be used to test the difference in population mean, that is when the population is n≠¤30 and the standard deviation of the population is estimated from the standard deviation of the sample. Whereas z-test is used when the population means is known together with standard deviation. Researchers do not have enough time to study the whole population. To study the entire population would be tedious and time-consuming; therefore, representative sample from the population is appropriate in the data collection. In statistical inferences, conclusions are drawn about the attribute of the population, e.g. the standard deviation or mean based on sample data analysis. Supposing there was a need to calculate the average weight of the population of youths in America, it would be unreasonable except at massive cost to weigh up each individual and calculate the mean weight. Another scenario is that testing process may be very destructive such that sampling becomes the only sufficient way.