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Unit C, Review Exercise C.038 Online Browsing on a Phone A recent study1 shows that 17%...

Unit C, Review Exercise C.038

Online Browsing on a Phone A recent study1 shows that 17% of a random sample of 1954 cell phone owners do most of their online browsing on their phone. The standard error for the proportion is 0.0085 . The sample size is large enough to use a normal distribution. 1Smith, A., “Cell Internet Use 2012,” Pew Research Center, pewresearch.org, June 26, 2012.

(a) Find a 99% confidence interval for the proportion of cell phone owners who do most of their online browsing on their phone. Round your answers to one decimal place. The 99% confidence interval is ____ % to _____ % .

(b) Use a normal distribution to test whether there is evidence that the proportion is greater than 0.15 .

State the null and alternative hypotheses.

(c) Give the test statistic and the p -value and state the conclusion of the test. Round your answer for the test statistic to two decimal places and your answer for the p -value to three decimal places.

Test statistic = _____

p -value = _____

Conclusion: Reject or do not reject H0?

Math   Statistics-And-Probability   
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