Pada tugas praktikum kali ini, akan dibahas latihan soal nomor 5.11 (Montgomery, hlm.415). Berikut soalnya 5.11 Table 8.2 contains data on pharmaceutical product sales. a. Fit an ARIMA model to this time series, excluding the last 10 observations. Investigate model adequacy. Explain how this model would be used for forecasting. b. Forecast the last 10 observations. c. In Exercise 4.12, you were asked to use simple exponential smoothing with λ=0.1 to smooth the data, and to forecast the last 10 observations. Compare the ARIMA and exponential smoothing forecasts. Which forecasting method do you prefer? d. How would prediction intervals be obtained for the ARIMA forecasts?

Hypothesis testing is a statistical method used to make inferences or draw conclusions about a population based on sample data.

A quick presentation on what P-Values are, how they are used, and how ethics play a role in statistical modeling.

In this presentation we examine one method of statistical inference, hypothesis testing, with a one-sample t-test utilizing data from the National Heath and Nutrition Examination Survey.