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Response is Sales P r o m o t i o n Q a u P l a r l i e i Mallows c x t Vars R-Sq R-Sq(adj) Cp S e p y 1 81.3 79.8 6.1 7.8239 X 1 58.0 54.5 26.2 11.734 X 1 9.5 2.0 68.1 17.221 X 2 85.7 83.0 4.4 7.1630 X X 2 82.9 79.8 6.8 7.8193 X X 2 69.2 63.6 18.6 10.499 X X 3 88.4 84.9 4.0 6.7523 X X X A) Excluding the combination that includes all the variables, which variables would you consider to include into the model based on Mallows Cp criterion? B) If you want to consider a regression model with just one independent variable, which one would you include according to R-Sq(adj) criterion?
The following frequency distribution shows the time (in minutes) that a sample of students uses the computer terminals per day. Compute the coefficient of variation.
4 7 7 5 2 9 7 6 8 5 8 4 1 5 2 8 7 6 6 9. (a) Determine three quartiles and (b) draw box-and-whisker plot of the data.
If they wish to estimate the population proportion within 0.03 and use 95 percent confidence, what is the largest random sample that they will need?
You will perform the non-parametric version of the tests you used in Activity 4. In each case, assume that you opted to use the non-parametric equivalent rather than the parametric test. Using the data files from earlier activities, complete the foll..
According to the local union president, the mean gross income of plumbers in the Salt Lake City area follows the normal probability distribution with a mean $45,000 and a standard deviation of $3,000.
Evaluate the performance of the judges.
Suppose there are two elementary schools in a county. One school (A) loans all its students a laptop computer for use in classes. The other (B) does not
he Department of Motor Vehicles (DMV) can service customers at a rate of 20 per hour (or 1/3 per minute) when it comes to license renewals. The service time follows an exponential distribution.
A random sample of size 25 is taken from a normal population having a mean of 80 and a standard deviation of 5. A second random sample of size 36 is taken from a different normal population having a mean of 75 and a standard deviation of 3.
In the survey of 8000 women, 5431 say they change their nail polish once the week. Create the 99% confidence interval for population proportion of women who change their nail polish once a week.
Does this result support original claim, or is population percentage considerably less than 45%. Use alpha=.05 for level of significance.
Student A and B took different statistics classes and 2 different finals. Student A had a score of 83 out of 100 and ranked 72 in his class. Student b scored 85 out of 100 and he ranked in the 70 percentile of his class.
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