Confidence interval for survey
A study asked 1009 adults which causes of death they thought would likely become more common in the future. 70% stated that gun violence would increase. Give a 95% confidence interval for this survey.
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The average length of stay at a local hospital is 4.9 days. Assuming a population standard deviation of 3.5 days, what is the probability a random sample of 50 patients has an average stay of 5.2 days or less?
A sample of 500 Drivers was asked whether or not they speed while driving. The following tabel gives a two-way classification:
Assume the GPA of STAT230 students is distributed normally with a population standard deviation of 0.10. To test whether the average GPA of STATS II students is GREATER THAN 3.12, a sample size of 49 was drawn and a sample mean of 3.15 was calcula
A simple random sample of 49 8th graders at a large suburban middle school indicated that 82% of them are involved with some type of after school activity. Find the 99% confidence interval that estimates the proportion of them that are involved i
Gigi and Ron are candidates for mayor in a city. You want to estimate the proportion of Gigi's voters with 90% confidence and a margin of error that is no greater than 3%. What is the smallest sample size needed to accomplish this?
Construct a 99 Confidence Interval for the mean time per day spent listening to music for those who actually replied. What sample size is necessary to make a 95% CI for those who replied? The margin of error should be 0.1.
A study of religious practices among college students interviewed a sample of 245 students; 157 of whom stated they pray at least once in a while. Determine the sample proportion. Round your answer to two decimal places.
The decomposition approach to forecasting may be helpful when attempting to forecast a time-series. Could an analogous approach be used in a multiple regression analysis?
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