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An inexperienced on-line instructor would like to estimate the mean time that it takes her students...
An inexperienced on-line instructor would like to estimate the mean time that it takes her students...
An inexperienced on-line instructor would like to estimate the mean time that it takes her students to complete one of her tests. She takes a random sample of 30 test times and finds that the mean in the sample is 36 minutes with a standard deviation in the sample of 3 minutes. Which of the following would be the appropriate calculation for constructing a 98% confidence interval to estimate the mean test time for all of her students? a. 34.726...
11. A Biology instructor is wondering about the average amount of time a student spent studying...
11. A Biology instructor is wondering about the average amount of time a student spent studying for a test. She asks a random sample of 18 of her students for their amount of study time and determines that the mean study time in the sample is 6.3 hours with a standard deviation in the sample of 1.94 hours. She believes that it is reasonable to assume that the overall distribution of study times is normal. Give this instructor a 98%...
The owner of an oil change shop would like to know the mean time it takes...
The owner of an oil change shop would like to know the mean time it takes to do an oil change at the shop. He takes a random sample of 16 cars that are serviced and finds a sample average of 20.5 minutes and a standard deviation of 7.4 minutes Construct a 90% confidence interval for the true mean time to do an oil change to a car. a) Lower Bound b) Upper Bound
10. A veterinarian is curious about the average length of her canine patients' tails. She uses...
10. A veterinarian is curious about the average length of her canine patients' tails. She uses the next 18 dogs that come into her clinic as a sample and finds that the mean tail length in the sample is 9.1 in. Previous large-scale studies have indicated that the standard deviation for the lengths of dogs' tails is about 2.2 and that the tail lengths are normally distributed. Construct a 90% confidence interval for the mean length of this vet's dogs'...
A book about different colleges' reports that the mean time students at a particular university study...
A book about different colleges' reports that the mean time students at a particular university study each week is 1015 minutes. A dean says she believes the mean is greater than 1015 minutes. To test her claim, she takes a random sample of 64 students and finds that the sample mean is 1050 minutes, with standard deviation 150 minutes 4. Show that this meets the requirements for a significance test for a mean. State the null hypothesis and the alternate...
Annie is a researcher who wants to find a confidence interval estimate of the mean time...
Annie is a researcher who wants to find a confidence interval estimate of the mean time it takes to complete an order over the phone at a call center for a large retail company. She has selected a random sample of 18 orders and recorded the time to complete the order. The sample mean time was 4.27 minutes and the sample standard deviation was 0.78 minutes. Assuming the conditions needed for inference are met,which of the following is the appropriate...
A confidence interval for the difference in the mean time for female (Sample 1) and male...
A confidence interval for the difference in the mean time for female (Sample 1) and male (Sample 2) students to complete a statistics test was constructed using independent random samples: −0.5 minutes < µ1 − µ2 < 1.3 minutes What does the confidence interval suggest about the difference in length between male and female test completion times? A. Male students take longer to complete a statistics test. B. Female students take longer to complete a statistics test. C. Male and...
A professor finds that for 9 randomly selected students the time needed to complete an assignment...
A professor finds that for 9 randomly selected students the time needed to complete an assignment had a sample mean of 60 minutes and a sample standard deviation of 18 minutes. The 98% confidence interval estimate for the population mean is: a. 50.99 - 77.01 b. 42.62 - 77.38 c. 59.00 - 69.00 d. 41.37 - 65.63 QUESTION 26 After estimating the interval in the previous question, we can interpret it as: a. We are 98% confident that the true...
Managers at an automobile manufacturing plant would like to estimate the mean completion time of an...
Managers at an automobile manufacturing plant would like to estimate the mean completion time of an assembly line operation, . The managers plan to choose a random sample of completion times and estimate ji via the sample. Assuming that the standard deviation of the population of completion times is 10.3 minutes, what is the minimum sample size needed for the managers to be 95% confident that their estimate is within 2.2 minutes of u? Carry your intermediate computations to at...
Bob Nale is the owner of Nale’s Quick Fill. Bob would like to estimate the mean...
Bob Nale is the owner of Nale’s Quick Fill. Bob would like to estimate the mean number of gallons of gasoline sold to his customers. Assume the number of gallons sold follows the normal distribution with a population standard deviation of 2.30 gallons. From his records, he selects a random sample of 70 sales and finds the mean number of gallons sold is 5.70. a. What is the point estimate of the population mean? (Round your answer to 2 decimal...
An inexperienced on-line instructor would like to estimate the mean time that it takes her students to complete one of her tests. She takes a random sample of 30 test times and finds that the mean in the sample is 36 minutes with a standard deviation in the sample of 3 minutes. Which of the following would be the appropriate calculation for constructing a 98% confidence interval to estimate the mean test time for all of her students? a. 34.726...
11. A Biology instructor is wondering about the average amount of time a student spent studying for a test. She asks a random sample of 18 of her students for their amount of study time and determines that the mean study time in the sample is 6.3 hours with a standard deviation in the sample of 1.94 hours. She believes that it is reasonable to assume that the overall distribution of study times is normal. Give this instructor a 98%...
10. A veterinarian is curious about the average length of her canine patients' tails. She uses the next 18 dogs that come into her clinic as a sample and finds that the mean tail length in the sample is 9.1 in. Previous large-scale studies have indicated that the standard deviation for the lengths of dogs' tails is about 2.2 and that the tail lengths are normally distributed. Construct a 90% confidence interval for the mean length of this vet's dogs'...
A book about different colleges' reports that the mean time students at a particular university study each week is 1015 minutes. A dean says she believes the mean is greater than 1015 minutes. To test her claim, she takes a random sample of 64 students and finds that the sample mean is 1050 minutes, with standard deviation 150 minutes 4. Show that this meets the requirements for a significance test for a mean. State the null hypothesis and the alternate...
Annie is a researcher who wants to find a confidence interval estimate of the mean time it takes to complete an order over the phone at a call center for a large retail company. She has selected a random sample of 18 orders and recorded the time to complete the order. The sample mean time was 4.27 minutes and the sample standard deviation was 0.78 minutes. Assuming the conditions needed for inference are met,which of the following is the appropriate...
Managers at an automobile manufacturing plant would like to estimate the mean completion time of an assembly line operation, . The managers plan to choose a random sample of completion times and estimate ji via the sample. Assuming that the standard deviation of the population of completion times is 10.3 minutes, what is the minimum sample size needed for the managers to be 95% confident that their estimate is within 2.2 minutes of u? Carry your intermediate computations to at...
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