Math 220, Fall 2009, Garren
-------------------------------------------------------------
(A) At least twice on your output, use SPSS to print your name.
-------------------------------------------------------------
(B) Suppose the data set {191, 198, 184, 187, 189, 191, 181, 194, 196, 186, 187, 194, 190} represents sales (in dollars) of 13 iPods on eBay. Using this data set, perform the following steps.
(1) Label the variable as "price".
(2) Using SPSS, print the data.
(3) Using SPSS, construct the Q-Q plot.
(4) Explain whether or not the normality assumption is reasonable for this data set, based on your answer to part (B3).
(5) Using SPSS, construct the 90% confidence interval on the population mean.
(6) Circle and label this 90% confidence interval in your SPSS output.
-------------------------------------------------------------
(C) Change the random number seed to the last five digits of your student identification number.
-------------------------------------------------------------
(D) Using SPSS:
(1) In column #1, generate 15 random variates from a Normal(mu=60, sigma=20) population.
(2) Label the variable as "X1".
(3) Repeat parts (D1) and (D2) nine more times, except the nine additional sets of 15 numbers should be labeled as "X2" through "X10" and should be placed in columns 2 through 10. You will eventually need to print these data, which should be a 15 by 10 table.
(4) Use SPSS to determine an 80% confidence interval on the mean for each of your 10 data sets.
(5) Next to your 10 confidence intervals, write either "contains the mean" or "does not contain the mean" according to whether or not your confidence interval contains the population mean (i.e., mu=60). (Note: I am *NOT* asking you if your confidence intervals contain the sample mean. After all, the sample mean is always in the middle of the confidence interval. I want to know if your confidence intervals contain 60.)
(6) Based on your answers to part (D5), write the proportion of your 80% confidence intervals which contain the population mean, 60.
-------------------------------------------------------------
(E) Although you are allowed to receive help from others, list the names of those who helped you and the names of those whom you helped, as well as what type of help was given. If you did not give or receive help, then write "No help" on the first page.
(F) Staple your work together in the order that the problems were assigned above.
-------------------------------------------------------------
Return to Dr. Garren's home page.