Can you pleas answer it on a computer. Thank you. NAME: Chapter Homework Estimat
ID: 3217465 • Letter: C
Question
Can you pleas answer it on a computer.Thank you. NAME: Chapter Homework Estimating the Population Proportion 1. What proportion of pizza restaurants that are primarily for walk-in business have a salad bar? Suppose that, in an effort to determine this figure, a random sample of 1,250 of these restaurants across the United States based on the Yellow Pages is called. If997 of the restaurants sampled have a salad bar, what is the 98% confidence interval for the population proportion? Estimating the Population Variance 2. The Interstate Conference of Employment Security Agencies says the average workweek in the U.S. is down to only 35 hours, largely because of a rise in part-time workers. Suppose this figure was obtained from a random sample of20 workers and that the standard deviation of the sample was 4.3 hours. Assume hours worked per week are normally distributed in the population. Use this sample information to develop a 98% confidence interval for the population variance of the number of hours worked per week for a worker. Interpret your answer in standard deviation units as well. Estimating the Sample Size 3. What proportion of UTSA students are actually happy to be in college? You want to answer this question by conducting a random survey. How large a sample should you take if you want to be 95% confident of the results and you want the error of the confidence interval to be no more than 0.05. Assume no one has any idea what the proportion actually is.
Explanation / Answer
1. The 98% confidence interval for single proportion is (0.771, 0.824). The proprotion value is 0.798.
2. The 98% confidence interval for single variance is (179.489 , 851.340) . from the confidence interval the standard deviation value lies between 13.397 and 29.177
3.