Author:
Christine Farr

A market research firm wants to find out if men and women feel differently aboutSilkyTouch facial tissues. In a survey of 90 men, 76% said they had a favorableimpression of SilkyTouch. Out of 182 surveyed women, 64% said they had a favorableimpression of SilkyTouch.At a 95% confidence level, which conclusion should the research firm draw?Overall, about 70% of the population has a favorable impression ofSilkyTouch.Men and women feel differently about SilkyTouch.More women than men have a favorable impression of SilkyTouch.There is insufficient evidence to show that men and women feeldifferently about SilkyTouch22.A campaign strategist wants to determine whether demographic shifts have caused adrop in allegiance to the Uniformian Party in Bowie County. Historically, around 62% ofthe county's registered voters have supported the Uniformians. In a survey of 196registered voters, 57% indicated that they would vote for the Uniformians in the nextelection.Assuming a confidence level of 95% and conducting a one-sided hypothesis test, whichof the following should the strategist do?Accept the hypothesis that the proportion of Uniformian voters has notchanged.Accept the hypothesis that the proportion of Uniformian voters hasdecreased.Conclude that the proportion of Uniformian voters is now between 56%and 62%.There is not enough evidence to support the hypothesis that the proportion of Uniformian voters has decreased.23.A manufacturer of guitar amplifiers markets one of its models, Vagabond, at apower rating of 45 watts. GuitarGod magazine suspects that this rating isinaccurate for this year's model of the amp. In a random sample of 32 units ofthis year's version of the Vagabond the mean output power is 42 watts, with astandard deviation of 8 watts.Assuming a confidence level of 95%, which of the following statements dothese data support?This year's Vagabond's output power is 45 watts.This year's Vagabond's output power is 42 watts.This year's Vagabond's output power is not 45.None of the above.24.The regression analysis below characterizes the relationship between monthlyice cream consumption (in pints per household) and the independent variable"average monthly temperature" (in degrees Fahrenheit).

Tutorial