The administration wants to know if the mean time students s…
The administration wants to know if the mean time students spend on TikTok per day exceeds 2 hours. In a survey of 40 students, the mean was 2.3 hours with a standard deviation of 1.1 hours.Perform a hypothesis test at the 0.01 significance level. Is there enough evidence to support the claim that students spend more than 2 hours per day on TikTok?
Read DetailsA tire manufacturer claims that the standard deviation of th…
A tire manufacturer claims that the standard deviation of the air pressure in its tires is no more than 1.5 PSI. To test this claim, a quality inspector randomly selects a sample of 10 tires and measures the pressure in each one. The sample has a standard deviation of 2.2 PSI. Assume the air pressures are normally distributed. Use a 0.05 significance level to test the manufacturer’s claim.
Read DetailsThe CDC recommends adults get at least 7 hours of sleep. A r…
The CDC recommends adults get at least 7 hours of sleep. A researcher believes that college students get less sleep than this. A sample of 45 students reported a mean of 6.6 hours with a standard deviation of 0.9 hours. Using a 0.05 level of significance, test whether college students are getting less than the recommended 7 hours of sleep. Be sure to define your hypotheses, test statistic, and conclusion.
Read DetailsA travel blogger writes a guide on visiting Paris, using viv…
A travel blogger writes a guide on visiting Paris, using vivid descriptions to excite potential tourists. Meanwhile, a scientist writes a research paper about climate change, using precise data and formal language. Even though they have different styles, both writers are practicing effective writing because they are tailoring their message to the intended _______________________ and fulfilling the intended _______________________.
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