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In a Gallup poll of 2500 adults in the United States, 75% of the respondents said...

In a Gallup poll of 2500 adults in the United States, 75% of the respondents said that they log in to social media applications daily.

(a) How many of the respondents in the Gallup poll said they log in to social media applications daily?

(b) Find a 90% confidence interval for the population proportion. Interpret the interval.

(c) Using the same sample, test the claim that more than 80% of adults check their social media accounts daily at the 0.01 level of significance. Be sure to state the null hypothesis, alternative hypothesis and conclusion. You do not need to verify the requirements of a hypothesis test.

Math   Statistics-And-Probability   
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