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question 3

Directions: A 2011 Gallup survey based on telephone and face-to-face interviews with a 3. Get a 95% confidence interval for the percentage of Product C that are purchased by males. sample of adults in China suggests that 20% smoke regularly or occasionally, with a margin of error of 2.2%. Give the confidence interval. Provide your response. 4. How many more units of product C must be sampled to reduce the margin of error to 3%? Directions: You want to obtain a sample to estimate the percentage of college students Directions: We wish to estimate what percent of 18 to 25-year old's that own a Samsung in the U.S. that get a GPA of least a 2.5. You would like to be 95% confident that your phone. Out of 400 sampled, 104 had a Samsung phone. Based on this, construct a 90% estimate is within 3% of the true population proportion. You have no reasonable estimate confidence interval for the proportion of all adults that own a Samsung phone. for the population proportion. You do not know the number college students in the U.S., but you know it's very large. How large of a sample size is required? Provide your response. Provide your response. Directions: The table below gives the number of people that bought either product A, B, or C and their gender. Use the table to complete the 95% confidence intervals. Directions: You want to obtain a sample to estimate the percentage of college students What are the answers to the following four questions? in the U.S. that get a GPA of least a 2.5. You would like to be 95% confident that your estimate is within 3% of the true population proportion. You have an estimate from a sample, that the percentage is 80%. How large of a sample size is required? Gender/Product |Product A Product B Product C Total Male 20 40 35 95 Female 30 30 50 110 Provide your response. Total 50 70 85 205 1. Get a 95% confidence interval for the percentage of females that choose product B. 2. How many more females would you need to sample to reduce your margin of error to 3%