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We intend to estimate the average driving time of Chicago commuters. From a previous study, we...
9) We intend to estimate the average driving time of a group of commuters. From a...
9) We intend to estimate the average driving time of a group of commuters. From a previous study, we believe that the average time is 42 minutes with a standard deviation of 10 minutes. We want our 99 percent confidence interval to have a margin of error of no more than plus or minus 2 minutes. What is the smallest sample size that we should consider? A) 332 9) B) 166 C) 13 D) 17
1. Find the critical value zα/2 that corresponds to a 94% confidence level. Round your answer...
1. Find the critical value zα/2 that corresponds to a 94% confidence level. Round your answer to two decimal places. 2. The following confidence interval is obtained for a population proportion, p: 0.273 < p < 0.592. Use these confidence interval limits to find the sample proportion . Round your answer to three decimal places. 0.433 3. Find the minimum sample size : How many commuters must be randomly selected to estimate the mean driving time μ of Chicago commuters?...
5. The servicing time at the drive-through lane of a fast food restaurant follows an exponential distribution. The average servicing time is 2 minutes. (4 points) YORKVILLE BUSI 1013 statistics...
5. The servicing time at the drive-through lane of a fast food restaurant follows an exponential distribution. The average servicing time is 2 minutes. (4 points) YORKVILLE BUSI 1013 statistics for Business What is the probability that it takes more than 2.5 minutes to service a customer at the drive-through lane? b. a. What percent of customers at the drive-through lane will take between 1 to 3 minutes to service? Part B 1. A simple random sample of 50 customers...
In order to estimate the average time spent on the computer terminals per student at a...
In order to estimate the average time spent on the computer terminals per student at a local university, data were collected from a sample of 81 business students over a one-week period. Assume the population standard deviation is 1.2 hours. If the sample mean is 9 hours, then the 95% confidence interval is approximately a. The 95% interval because it is a less accurate interval. The 95% interval because it is a less accurate interval. b. The 99% interval because...
Suppose you want to study the average glucose levels, measured in mg/dL, of people from a...
Suppose you want to study the average glucose levels, measured in mg/dL, of people from a local city whose standard deviation is known to be σ=3.45, and you gather a sample whose characteristics is given by: x¯=95.3 s=4.73 n=43 Suppose we want to create a two-sided 93% confidence interval for the mean population average glucose level, what would be the associated critical value? (2 decimal places) Suppose we want to create a two-sided 93% confidence interval for the mean population...
Suppose it is desired to estimate the average time a customer spends in a particular store...
Suppose it is desired to estimate the average time a customer spends in a particular store to within 5 minutes with 99% confidence. It is estimated that the range of the times a customer spends in the store is 90 minutes. How large a sample should be taken to get the desired interval? Right-click the link to use this Z table (The answer is NOT 135, or 134.37) (I believe the standard deviation is not 22.5) The answer is 60,...
The average time to drive from Joliet to Chicago in non-rush hour traffic on I 55...
The average time to drive from Joliet to Chicago in non-rush hour traffic on I 55 is 48 minutes with a sample standard deviation of 6.3 minutes. For n = 65, find the 95% confidence interval for the mean. Meijer has 10 lbs. of potatoes on sale for Thanksgiving. If the bags have a population standard deviation of .75 lbs., find the 90% confidence interval for the mean for n = 50. At JJC, 125 out of 200 students take...
We want to know the average number of hours financial advisors in your area work a...
We want to know the average number of hours financial advisors in your area work a month. You survey 76 random advisors and find the average hours they work per month is 189. You also believe that the population standard deviation is 20 hours a month. Give a 99% confidence interval for the estimated average number of hours financial advisors work per month. Confidence Interval Estimate for the Mean Data Population Standard Deviation 20 Sample Mean 189 Sample Size 76...
Managers believe that the average time to process a package at the front of the counter...
Managers believe that the average time to process a package at the front of the counter of the Mercuric post office is about three minutes. They want to do a work sampling study to estimate this time more accurately. From a small pilot sample, the standard deviation is estimated to be 0.16 minutes. Management wants to find the sample size needed to achieve a maximum allowable sampling error of ±0.025 minutes with 95 percent confidence. Note: Answer in two decimal...
A local pizza place claims that they average a delivery time of 10.14 minutes. To test...
A local pizza place claims that they average a delivery time of 10.14 minutes. To test this claim, you order 13 pizzas over the next month at random times on random days of the week. You calculate that the average delivery time is 8.59 minutes with a standard deviation of 1.721 minutes. You create a 99% confidence interval of (7.13, 10.05). Of those listed below, what is the best conclusion you can make? Question 7 options: 1) The percentage of...
9) We intend to estimate the average driving time of a group of commuters. From a previous study, we believe that the average time is 42 minutes with a standard deviation of 10 minutes. We want our 99 percent confidence interval to have a margin of error of no more than plus or minus 2 minutes. What is the smallest sample size that we should consider? A) 332 9) B) 166 C) 13 D) 17
5. The servicing time at the drive-through lane of a fast food restaurant follows an exponential distribution. The average servicing time is 2 minutes. (4 points) YORKVILLE BUSI 1013 statistics for Business What is the probability that it takes more than 2.5 minutes to service a customer at the drive-through lane? b. a. What percent of customers at the drive-through lane will take between 1 to 3 minutes to service? Part B 1. A simple random sample of 50 customers...
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