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9. The principal at a local high school asked 100 randomly selected students how many minutes they spend completing homework each night of the week. The mean time students in the sample spent on homework each night was 72.5 minutes. Assume the population mean time spent on homework each night is 81.2 minutes. Which of the following is the correct representation of the mean time spent on homework for the 100 randomly selected students in the sample and the population of students at the school? a. b. C. = 72.5 minutes and = 81.2 minutes, both are parameters. = 72.5 minutes and = 81.2 minutes, 72.5 is a parameter, but 81.2 is a statistic. = 72.5 minutes and 4= 81.2 minutes. 72.5 is a statistic but 81 ? is a parameter

9. The principal at a local high school asked 100 randomly selected students how many minutes they spend completing homework each night of the week. The mean time students in the sample spent on homework each night was 72.5 minutes. Assume the population mean time spent on homework each night is 81.2 minutes. Which of the following is the correct representation of the mean time spent on homework for the 100 randomly selected students in the sample and the population of students at the school? a. b. C. = 72.5 minutes and = 81.2 minutes, both are parameters. = 72.5 minutes and = 81.2 minutes, 72.5 is a parameter, but 81.2 is a statistic. = 72.5 minutes and 4= 81.2 minutes. 72.5 is a statistic but 81 ? is a parameter

A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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h Name: 10. 9. a. b. C. d. The principal at a local high school asked 100 randomly selected students how many minutes they spend completing homework each night of the week. The mean time students in the sample spent on homework each night was 72.5 minutes. Assume the population mean time spent on homework each night is 81.2 minutes. Which of the following is the correct representation of the mean time spent on homework for the 100 randomly selected students in the sample and the population of students at the school? a. μ= 72.5 minutes and = 81.2 minutes, both are parameters. b. C. d. A manufacturer claims that only 2% of their products are defective. A store receives a delivery of 300 items from the manufacturer. Let p = the proportion of defective items in a sample of 300 items. Assuming the manufacturer is correct that only 2% of their products are defective, what are the mean and standard deviation of the sampling distribution of p? The mean is 0.02 and the standard deviation is 0.008. The mean is 6 and the standard deviation is 2.42. The mean is 6 and the standard deviation is 5.88. The mean is 0.02 and the standard deviation is 0.196. ID: B = 72.5 minutes and x = 81.2 minutes, 72.5 is a parameter, but 81.2 is a statistic. x = 72.5 minutes and = 81.2 minutes, 72.5 is a statistic, but 81.2 is a parameter. x = 72.5 minutes and = 81.2 minutes, both are statistics. 11. The mean number of items purchased by shoppers at a grocery store is strongly skewed right with a mean of 14.5 and a standard deviation of 8.6. A random sample of size 100 will be selected. What is the mean and standard deviation of the number of items purchased by shoppers in all possible samples of that size? 2. The distribution of the age of the employees at large manufacturing plant is strongly skewed left with a mear of 42.19 years old and a standard deviation of 9.86 years old. The manager of the manufacturing plant plans to select a random sample of 35 employees to survey about their attitudes towards management and work ethics. a. What is the shape of the sampling distribution of x, the sample mean age of the employees for sample size n = 35? b. What is the approximate probability that the mean age for a sample of size n = 35 is no more than 40 years old? Based on your answer to the part (b), would you be surprised if the manager selected a sample and sample mean was no more than 40 years old? Explain. e amount of money customers at a local restaurant spend per meal is approximately normally dist a mean of $20.91 and a standard deviation of $6.13. The manager plans to select a random san Omers to survey the quality of the service the restaurant offers. Calculate the mean and standard deviation of the sampling distribution of x, the sample mean Oney spent per customer at the restaurant for samples of size n = 10. erpret the standard deviation of the sampling distribution calculated in part (a). = manager believes that if a customer spends more than $25, the customer will have a mo ion of the service the restaurant offers than if a customer does not spend more than $2 robability that in a random sample of 10 customers, the sample mean would be mora
Transcribed Image Text:h Name: 10. 9. a. b. C. d. The principal at a local high school asked 100 randomly selected students how many minutes they spend completing homework each night of the week. The mean time students in the sample spent on homework each night was 72.5 minutes. Assume the population mean time spent on homework each night is 81.2 minutes. Which of the following is the correct representation of the mean time spent on homework for the 100 randomly selected students in the sample and the population of students at the school? a. μ= 72.5 minutes and = 81.2 minutes, both are parameters. b. C. d. A manufacturer claims that only 2% of their products are defective. A store receives a delivery of 300 items from the manufacturer. Let p = the proportion of defective items in a sample of 300 items. Assuming the manufacturer is correct that only 2% of their products are defective, what are the mean and standard deviation of the sampling distribution of p? The mean is 0.02 and the standard deviation is 0.008. The mean is 6 and the standard deviation is 2.42. The mean is 6 and the standard deviation is 5.88. The mean is 0.02 and the standard deviation is 0.196. ID: B = 72.5 minutes and x = 81.2 minutes, 72.5 is a parameter, but 81.2 is a statistic. x = 72.5 minutes and = 81.2 minutes, 72.5 is a statistic, but 81.2 is a parameter. x = 72.5 minutes and = 81.2 minutes, both are statistics. 11. The mean number of items purchased by shoppers at a grocery store is strongly skewed right with a mean of 14.5 and a standard deviation of 8.6. A random sample of size 100 will be selected. What is the mean and standard deviation of the number of items purchased by shoppers in all possible samples of that size? 2. The distribution of the age of the employees at large manufacturing plant is strongly skewed left with a mear of 42.19 years old and a standard deviation of 9.86 years old. The manager of the manufacturing plant plans to select a random sample of 35 employees to survey about their attitudes towards management and work ethics. a. What is the shape of the sampling distribution of x, the sample mean age of the employees for sample size n = 35? b. What is the approximate probability that the mean age for a sample of size n = 35 is no more than 40 years old? Based on your answer to the part (b), would you be surprised if the manager selected a sample and sample mean was no more than 40 years old? Explain. e amount of money customers at a local restaurant spend per meal is approximately normally dist a mean of $20.91 and a standard deviation of $6.13. The manager plans to select a random san Omers to survey the quality of the service the restaurant offers. Calculate the mean and standard deviation of the sampling distribution of x, the sample mean Oney spent per customer at the restaurant for samples of size n = 10. erpret the standard deviation of the sampling distribution calculated in part (a). = manager believes that if a customer spends more than $25, the customer will have a mo ion of the service the restaurant offers than if a customer does not spend more than $2 robability that in a random sample of 10 customers, the sample mean would be mora
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