12 May 21. A market research firm wants to find out if men and women
21. A market research firm wants to find out if men and women feel differently about SilkyTouch facial tissues. In a survey of 90 men, 76% said they had a favorable impression of SilkyTouch. Out of 182 surveyed women, 64% said they had a favorable impression of SilkyTouch. At a 95% confidence level, which conclusion should the research firm draw? 窗体顶端 Overall, about 70% of the population has a favorable impression of SilkyTouch. 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 feel differently about SilkyTouch 窗体底端 22. A campaign strategist wants to determine whether demographic shifts have caused a drop in allegiance to the Uniformian Party in Bowie County. Historically, around 62% of the county’s registered voters have supported the Uniformians. In a survey of 196 registered voters, 57% indicated that they would vote for the Uniformians in the next election. Assuming a confidence level of 95% and conducting a one-sided hypothesis test, which of the following should the strategist do? 窗体顶端 Accept the hypothesis that the proportion of Uniformian voters has not changed. Accept the hypothesis that the proportion of Uniformian voters has decreased. 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 a power rating of 45 watts. GuitarGod magazine suspects that this rating is inaccurate for this year’s model of the amp. In a random sample of 32 units of this year’s version of the Vagabond the mean output power is 42 watts, with a standard deviation of 8 watts. Assuming a confidence level of 95%, which of the following statements do these data support? 窗体顶端 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. 窗体底端
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