Simulate an AR(2) model with n = 48, φ1 = 1.5, and φ2 = −0.75. (a) Fit the correctly specified AR(2) model and look at a time series plot of the residuals. Does the plot support the AR(2) specification? (b)Display a normal quantile-quantile plot of the standardized residuals. Does the plot support the AR(2) specification? (c) Display the sample ACF of the residuals. Does the plot support the AR(2) specification? (d)Calculate the Ljung-Box statistic summing to K = 12. Does this statistic support the AR(2) specification?

answer:   (s+1)(s+4)

step-by-step explanation:

factor s2+5s+4

s2+5s+4

=(s+1)(s+4)

no

explanation:

you can be freinds, and people but not follow people.

both the histogram and the stem and leaf plot will visually show how many shoppers were of various ages within each range of data.   the histogram does not give us the specific ages of these shoppers unlike the stem and leaf plot.a histogram does not give us a true range of the data because we do not know exactly how old the shoppers were. a stem and leaf plot will give exact ages, so we can determine the exact range along with all measures of center and the others measures of center.   with the histogram, we cannot find any of these.

step-by-step explanation: