The principal at Riverside High School would like to estimate the mean length of time each...
The principal at Riverside High School would like to estimate the mean length of time each day that it takes all the buses to arrive and unload the students. What is the minimum sample size needed if the principal would like to be 90% confident that the sample mean is off by, at most, 2 minutes. Assume that standard deviation is 14 minutes. (Approximate the final answer)
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The principal at Riverside High School would like to estimate
the mean length of time each...
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...
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? 2.34.726 <u...
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...
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 via the sample. Assuming that the standard deviation of the population of completion times is 10.4 minutes, what is the minimum sample si d ed for the managers to be 95% confident that their estimate is within 1.7 minutes of Can your Wermediate computations to at least three...
In order to estimate the mean amount of time computer users spend on the internet each...
In order to estimate the mean amount of time computer users spend on the internet each month, how many computer users must be surveyed in order to be 90% confident that your sample mean is within 11 minutes of the population mean? Assume that the standard deviation of the population of monthly time spent on the internet is 208 min. What is a major obstacle to getting a good estimate of the population mean? Use technology to find the estimated...
In order to estimate the mean amount of time computer users spend on the internet each...
In order to estimate the mean amount of time computer users spend on the internet each month, how many computer users must be surveyed in order to be 90% confident that your sample mean is within 15 minutes of the population mean? Assume that the standard deviation of the population of monthly time spent on the internet is 224 min. What is a major obstacle to getting a good estimate of the population mean? Use technology to find the estimated...
A recent national survey showed that the mean amount of time high school students spent per...
A recent national survey showed that the mean amount of time high school students spent per day using Snapchat was 65 minutes, with a standard deviation of 9 minutes. Mrs. Jones, a school principal, surveyed 100 of her students and computed a sample mean of 67.6 minutes of daily Snapchat use. She would like to determine, with a .01 significance level, whether her school is significantly different from the national results. State the null and alternate hypotheses for this two-tailed...
6. In order to estimate the mean amount of time computer users spend on the internet...
6. In order to estimate the mean amount of time computer users spend on the internet each month, how many computer users must be surveyed in order to be 90% confident that your sample mean is within 11 minutes of the population mean? Assume that the standard deviation of the population of monthly time spent on the internet is 228 min. What is a major obstacle to getting a good estimate of the population mean? Use technology to find the...
One researcher wishes to estimate the mean number of hours that high school students spend watching...
One researcher wishes to estimate the mean number of hours that high school students spend watching TV on a weekday. A margin of error of 0.27 hour is desired. Past studies suggest that a population standard deviation of 1.5 hours is reasonable. Estimate the minimum sample size required to estimate the population mean with the stated accuracy. The required sample size is (Round up to the nearest whole number.)
Mark wants to estimate the mean length of time (in minutes) all Middle School students spend reading online books. To determine this estimate, he took a random sample of 15 people and obtained the following results: 40, 110, 56, 20, 15, 10, 82, 60, 90, 11
Mark wants to estimate the mean length of time (in minutes) all Middle School students spend reading online books. To determine this estimate, he took a random sample of 15 people and obtained the following results: 40, 110, 56, 20, 15, 10, 82, 60, 90, 118, 35, 25, 5, 65, 30. The population of times is normally distributed. What is the margin of error at the 95% confidence level if the population standard deviation is 8 minutes? Round off you...
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...
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? 2.34.726 <u...
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...
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 via the sample. Assuming that the standard deviation of the population of completion times is 10.4 minutes, what is the minimum sample si d ed for the managers to be 95% confident that their estimate is within 1.7 minutes of Can your Wermediate computations to at least three...
In order to estimate the mean amount of time computer users spend on the internet each month, how many computer users must be surveyed in order to be 90% confident that your sample mean is within 15 minutes of the population mean? Assume that the standard deviation of the population of monthly time spent on the internet is 224 min. What is a major obstacle to getting a good estimate of the population mean? Use technology to find the estimated...
One researcher wishes to estimate the mean number of hours that high school students spend watching TV on a weekday. A margin of error of 0.27 hour is desired. Past studies suggest that a population standard deviation of 1.5 hours is reasonable. Estimate the minimum sample size required to estimate the population mean with the stated accuracy. The required sample size is (Round up to the nearest whole number.)
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