4. The following information is obtained concerning an investigation of 50 mobile user:SexMaleFemaleTotalLight user171835Heavy user31215Total203050(Use 95 % Confidence level for hypothesis testing)a) Develop the null hypothesis and alternative hypothesisd. Can it be inferred that females are relatively heavy users of mobile phone?c. Curve?d. Summary

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Answered: 4. The following information is…

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.3: Measures Of Spread

Problem 1GP

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The article “Facebook Use and Academic Performance Among College Students” estimated that 87% of students at alarge public university in California who are Facebook users update their status at least two times a day. This estimatewas based on a random sample of 261 students at this university. Does this sample provide convincing evidence thatmore than 80% of the students at this college who are Facebook users update their status at least two times per day?
A sample of 2010 adults were asked in 1990 whether they smoked (yes or no). This same sample was asked again about their smoking status two years later. The data are below. Is there a relationship between year and smoking status? Were people more likely to report being a smoker in one of the years? Use a 5% level of significance. 1) the appropriate null and alternative hypotheses; 2) the appropriate test; 3) the decision rule; 4) the calculation of the test statistic; and 5) your conclusion including a comparison to alpha or the critical value. 1992 1990 Smoker Non-smoker Total Smoker 620 97 717 Non-smoker 76 1217 1293 Total 696 1314 2010
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A researcher groups college student in a study based on their year in college (freshman, sophomore, junior, senior) and the type of college they attend (junior, technical, university). He concludes that perceptions of academic cheating are more positive among freshman attending junior college. To reach this conclusion, which statistical test would need to be computed?
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The report "Digital Democracy Survey"t describes a large national survey. In a representative sample of Americans ages 14 to 18 years, 45% indicated that they usually use social media while watching TV. Suppose that the sample size was 700. (a) Is there convincing evidence that less than half of Americans ages 14 to 18 years usually use social media while watching TV? Use a significance level of 0.05. State the appropriate null and alternative hypotheses. O Ho: p = 0.5 versus H: p > 0.5 O Ho: p + 0.5 versus H: p = 0.5 Ho: P 0.5 Ho: p = 0.5 versus H: p + 0.5 Ho: p = 0.5 versus H: p < 0.5 Find the test statistic and P-value. (Use a table or technology. Round your test statistic to two decimal places and your P-value to four decimal places.) z = P-value = State the conclusion in the problem context. Fail to reject H,. We have convincing evidence that less than half of Americans ages 14 to 18 years usually use social media while watching TV. Fail to reject H.. We do not have convincing…
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