Questions:
Which of the hypotheses tests below are two-tailed?
1. A school administrator believes that recent TAKS test scores are above the national average.
2. A car dealer believes that the average value of used cars has changed since the recession.
3. A Texas state senator has taken a sample of his constituents that indicates their incomes are below the historical state average. The senator asserts that Texas incomes have fallen.
All of the hypotheses are two-tailed.
Only 3 is two-tailed.
Only 2 is two-tailed.
1 and 3 are two- tailed.
4.In decomposition the seasonal indices are the period relationships between what two data series?
Seasonal moving averages and the trend data series.
Smoothed data from centered moving averaging and the original data series.
Trend data and the cycle factors.
Trend data and the original data series.
5.If you have trend in a data series how can you confirm it and determine if it is statistically significant"Autocorrelation functions that spike in the 4th and 8th quarters and have LBQ values below the LBQ table values.
A time series plot that shows the data rising and falling
Histogram that shows the data centered around a zero mean value with a normal distribution.
Autocorrelation functions that step down toward zero and have LBQ values above the Chi-square tables values.