1) A furniture retailer is studying the amount of time it takes their salespeople to arrange...
1) A furniture retailer is studying the amount of time it takes their salespeople to arrange for delivery. The retailer takes a sample of n = 25 times and computes a sample average of 5.2 minutes and a standard deviation of 2.4 minutes. b) Provide a 95% confidence interval on the standard deviation of the time required to arrange for delivery.
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1) A furniture retailer is studying the amount of time it takes
their salespeople to arrange...
In several of studies, it has been determined that 92% of the time, car salespeople spend...
In several of studies, it has been determined that 92% of the time, car salespeople spend between 27.5 and 62.5 minutes with potential customers, trying to convince them to buy a new car. In a random sample of 25 dealerships from across the country, it was found that the average amount of time the car salespeople spent with their customers was 45 minutes. a) From this information, calculate the population standard deviation for the time spent with a new customer...
3. A psychologist is studying learning in rts. The psychologist wants to determine the average ti...
3. A psychologist is studying learning in rts. The psychologist wants to determine the average time required for rats to learn to traverse a maze. She randomly selects 40 rats and records the time it takes for the rats to traverse the maze in minutes. The sample average time required for the rats to traverse the maze is 5 minutes with a standard deviation of 1 minute. Estimate the average time required for rats to learn to traverse the maze...
Question 2 1251 NICTUS furniture claims that the standard deviation in their delivery time is less...
Question 2 1251 NICTUS furniture claims that the standard deviation in their delivery time is less than 5 days. A sample of 30 past customers is taken. The average delivery time in the sample was 15 days with a sample standard deviation 5 days a. b. c. d Construct a 95% confidence interval for the population variance Construct a 90% confidence interval for the population standard deviation. State the null and alternative hypotheses to be tested. Test the company's claim...
(1 point) A medical researcher wants to investigate the amount of time it takes for patients'...
(1 point) A medical researcher wants to investigate the amount of time it takes for patients' headache pain to be relieved after taking a new prescription painkiller. She plans to use statistical methods to estimate the mean of the population of relief times. She believes that the population is normally distributed with a standard deviation of 25 minutes. How large a sample should she take to estimate the mean time to within 2 minutes with 94% confidence? Sample Size =
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%...
from prior experience we know time spent studying for an exam is approximately normally distributed.You survey...
from prior experience we know time spent studying for an exam is approximately normally distributed.You survey HC students and ask the participating students how many times do they spend studying for the exam. From your sample of 36 HC students ,you obtained the mean time spent to study for an exam was 160 minutes,with standard deviation of 40 mins. 2)construct a 95% confidence interval for the mean study time (in minutes) of HC students.
27) A fast food restaurant wants to know about how long, on average, a customer spends...
27) A fast food restaurant wants to know about how long, on average, a customer spends waiting in a drive-thru from the time their order ends to the time that they get their food. To investigate this, the restaurant takes a random sample of 36 cars and finds that it takes an average of 2.4 minutes. Suppose the restaurant knows that drive-thru times have a population standard deviation of 7 minutes. Calculate a 95% Confidence Interval for drive-thru times: (5...
1) A professor knows that in the past, the average amount of time spent studying the...
1) A professor knows that in the past, the average amount of time spent studying the night before the first exam was 140 minutes with a normal distribution and a standard deviation of 75.1. The professor finds that the average amount of time spent studying the night before the first exam for the current class of 40 students is 165 minutes. a) Please identify the following values from the above study description. The population mean (µ) equals ________________. The population...
most universities recommend spending 3 hours of outside studying for every 1 hour in lecture. For...
most universities recommend spending 3 hours of outside studying for every 1 hour in lecture. For courses with 3 hours of class a week there should be 9 hours of studying outside of class each week. You ask the 25 students in your recitation how many hours a week they spend studying outside of lecture/recitation. The sample average is 7 hours and a standard deviation of 4 hours. d. The parameter of interest is: the population mean (x the sample...
(1 point) Once checked in at the ticket kiosk, the amount of time it takes a...
(1 point) Once checked in at the ticket kiosk, the amount of time it takes a airline passenger at the Calgary International Airport to clear security is a random variable that can be modeled by the Exponential distribution with a = 35.1 minutes. A statistician is randomly select n = 40 airline passengers and record how long, in minutes, it takes each to clear security once each has checked in at the ticket kiosk. (a) Complete the statement below. Enter...
3. A psychologist is studying learning in rts. The psychologist wants to determine the average time required for rats to learn to traverse a maze. She randomly selects 40 rats and records the time it takes for the rats to traverse the maze in minutes. The sample average time required for the rats to traverse the maze is 5 minutes with a standard deviation of 1 minute. Estimate the average time required for rats to learn to traverse the maze...
Question 2 1251 NICTUS furniture claims that the standard deviation in their delivery time is less than 5 days. A sample of 30 past customers is taken. The average delivery time in the sample was 15 days with a sample standard deviation 5 days a. b. c. d Construct a 95% confidence interval for the population variance Construct a 90% confidence interval for the population standard deviation. State the null and alternative hypotheses to be tested. Test the company's claim...
(1 point) A medical researcher wants to investigate the amount of time it takes for patients' headache pain to be relieved after taking a new prescription painkiller. She plans to use statistical methods to estimate the mean of the population of relief times. She believes that the population is normally distributed with a standard deviation of 25 minutes. How large a sample should she take to estimate the mean time to within 2 minutes with 94% confidence? Sample Size =
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%...
27) A fast food restaurant wants to know about how long, on average, a customer spends waiting in a drive-thru from the time their order ends to the time that they get their food. To investigate this, the restaurant takes a random sample of 36 cars and finds that it takes an average of 2.4 minutes. Suppose the restaurant knows that drive-thru times have a population standard deviation of 7 minutes. Calculate a 95% Confidence Interval for drive-thru times: (5...
most universities recommend spending 3 hours of outside studying for every 1 hour in lecture. For courses with 3 hours of class a week there should be 9 hours of studying outside of class each week. You ask the 25 students in your recitation how many hours a week they spend studying outside of lecture/recitation. The sample average is 7 hours and a standard deviation of 4 hours. d. The parameter of interest is: the population mean (x the sample...
(1 point) Once checked in at the ticket kiosk, the amount of time it takes a airline passenger at the Calgary International Airport to clear security is a random variable that can be modeled by the Exponential distribution with a = 35.1 minutes. A statistician is randomly select n = 40 airline passengers and record how long, in minutes, it takes each to clear security once each has checked in at the ticket kiosk. (a) Complete the statement below. Enter...
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