A market researcher was interested in studying the effect of advertisements on brand preference of people purchasing a new personal computer. Prospective purchasers of new computers were first asked whether they preferred Apple or Dell and then watched video advertisements of comparable models of the two brands. After viewing the ads, the prospective customers again indicated their preferences. The results are summarized in the following table:

a. Is there evidence of a difference in the proportion of respondents who prefer Apple before and after viewing the ads? (Use α = 0.05.)
b. Compute the p-value and interpret its meaning.
c. Show how the following table was derived from the table above:

d. Using the second table, is there evidence of a difference in preference for Apple before and after viewing the ads? (Use α = 0.05.)
e. Determine the p-value and interpret its meaning.
f. Explain the difference in the results of (a) and (d). Which method of analyzing the data should you use? Why?
TEAM PROJECT
The file contains information regarding eight variables from a sample of 184 bond mutual funds:
Type-Type of bonds comprising the bond mutual fund
(intermediate government or short-term corporate)
Assets-In millions of dollars
Fees-Sales charges (no or yes)
Expense ratio-Ratio of expenses to net assets in percentage
Return 2009-Twelve-month return in 2009
Three-year return-Annualized return, 2007-2009
Five-year return-Annualized return, 2005-2009
Risk-Risk-of-loss factor of the bond mutual fund (below average, average, or above average)

Transcribed Image Text:

PREFERENCE AFTER ADS PREFERENCE BEFORE ADS Apple De Total Apple Dell Total 3 100 89 100 108 92 200 97 MANUFACTURER PREFERENCE Before ad After ad Total Apple De Total 100 200 108 92 200 192 400 100 208