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Advertising
A local financial advisor places advertise- ments in the local newspaper as well as on local cable television programs. Her success depends on how many callbacks these ads generate. She wants to know if the advertising is cost effective and has data for 83 recent weeks. These are not consecutive (holidays are omitted), but the data are presented in time order.
(a) From timeplots of the amounts spent for print and cable advertising and the number of call- backs, describe recent patterns in her business.
(b) The slope b1 in the simple regression of the number of calls on the cost of printed ads is larger than b1 in the simple regression of calls on the cost of cable ads. Because of this, she plans to devote more advertising to cable ads. Do you agree? Use a multiple regression of calls on both types of advertising.
(c) Does the multiple regression in (b) satisfy the conditions of the MRM?
(d) A colleague claims that advertising does not mat- ter. She's just benefiting from trends in financial behavior. Do you agree? Use another multiple regression to decide.
Let sample s approximate population sigma. How come the t- table in the AP booklet has degrees of freedom entries way past 30 ??? What am I missing??
Joe dealt 20 cards from a standard 52-card deck, and the number of red cards exceeded the number of black cards by 8. He reshuffled the cards and dealt 30 cards. This time, the number of red cards exceeded the number of black cards by 10. Dete..
Canada has several small biotechnology companies which are research intensive and develop chemical compounds that may prove to be useful drugs, but they typically do not have the funding or global reach to test the compounds for government approva..
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The amount of a brand of soda in 12-ounces can is approx. normal with a mean of 12.1 ounces and a standard deviation of 0.15 ounces.
It is reported in USA Today that the average flight cost nationwide is $342.59. You have never paid close to that amount and you want to perform a hypothesis test that the true average is actually less than $342.59. What are the appropriate hypoth..
Perform exploratory data analysis on CreativityPre and CreativityPost. Using SPSS, calculate the mean and standard deviation of these two variables.
The Big Triple at the local racetrack consists of picking the correct order of finish of the first three horses in the ninth race. If there are 12 horses entered in today's ninth race, how many Big Triple outcomes are possible?
in a certain population 1 of the individuals are infected with a certain virus. a test is applied to the whole
Analysis of Covariance. Using your area of interest, identify one independent and two dependent variables, such that the dependent variables would likely be covariates
a calculate the estimate for the standard error of difference between two independent means fornbsps12nbsp
Modify the program again to print out, every 100 times, both of the following quantities: the proportion of heads minus 1/2, and the number of heads minus half the number of tosses. Do these numbers appear to approach 0 as n increases?
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