Sample size problems Instructions: - Use the formulas and table above to answer the four (4) sample size problems on the right. - You will likely need to slow down to answer all four (4) problems. Dawn warycs to survey consumers to estimate how many ounces of dish washing liquid the average consumer uses per month. They want to be 90% confident in their estimate and have an acceptable magnitude of error of 3 ounces. The U.S. Detergent Association estimates the standard deviation for dish washing liquid usage per month is 97 ounces. If a simple random sample is used without a population correction factor, what is the minimum number of sampling units needed? customers to estimate what proportion would be likely to recommend this location. They did a similar survey 3 years ago, and found the proportion to be 40%. This time around, they want to be 99% confident in their estimate and have an acceptable magnitude of error of 5 percentage points. If a simple random sample is used without a population correction factor, what is the minimum number of surveys that need to be sent if the response rate is expected to be 30% ? Panera is going to conduct a mail survey to determine the average weekly expenditure per household on bakery products from all stores. They want to be 95\% confident in their estimate with an acceptable magnitude of error of $0.80. Experts think the range of weekly spending is between $2 and $45. If a simple random sample is used without a population correction factor, what is the minimum number of sampling units needed? see what proportion prefer bottled ice tea over soda. They want to be 97.5% confident in their estimate and have an acceptable magnitude of error of 3.6 percentage points. Because they have never done such a study before, Snapple does not have an estimate of what the proportion might be. If a simple random sample is used without a population correction factor, what is the minimum number of sampling units needed? Sample size problems Instructions: - Use the formulas and table above to answer the four (4) sample size problems on the right. - You will likely need to slow down to answer all four (4) problems. Dawn warycs to survey consumers to estimate how many ounces of dish washing liquid the average consumer uses per month. They want to be 90% confident in their estimate and have an acceptable magnitude of error of 3 ounces. The U.S. Detergent Association estimates the standard deviation for dish washing liquid usage per month is 97 ounces. If a simple random sample is used without a population correction factor, what is the minimum number of sampling units needed? customers to estimate what proportion would be likely to recommend this location. They did a similar survey 3 years ago, and found the proportion to be 40%. This time around, they want to be 99% confident in their estimate and have an acceptable magnitude of error of 5 percentage points. If a simple random sample is used without a population correction factor, what is the minimum number of surveys that need to be sent if the response rate is expected to be 30% ? Panera is going to conduct a mail survey to determine the average weekly expenditure per household on bakery products from all stores. They want to be 95\% confident in their estimate with an acceptable magnitude of error of $0.80. Experts think the range of weekly spending is between $2 and $45. If a simple random sample is used without a population correction factor, what is the minimum number of sampling units needed? see what proportion prefer bottled ice tea over soda. They want to be 97.5% confident in their estimate and have an acceptable magnitude of error of 3.6 percentage points. Because they have never done such a study before, Snapple does not have an estimate of what the proportion might be. If a simple random sample is used without a population correction factor, what is the minimum number of sampling units needed