Homework Answers
Given that: confidence interval (1.02, 2.98)
The correct interpretations are options A and D
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2 words Question 2 1 pts We surveyed a random sample of students and found that...
In the survey of a random sample of students at a university, two questions were, “How...
In the survey of a random sample of students at a university, two questions were, “How many hours per week do you usually study?” and “Have you smoked marijuana in the past six months?” An analysis of the results produced the following SPSS output: A research question of interest is whether students who have smoked marijuana (group Y) in the past 6 months differ in study hours on average per week than those who have not (group N). Using...
A random sample of community college students was asked the number of hours they sleep on...
A random sample of community college students was asked the number of hours they sleep on a typical week-night during a given academic term. The sample data are as follows: 8 6 4 5 3 7 S 4 3 4 4 5 6 8 7 7 7 3 3 4 What is the 90% confidence interval estimate for the true mean amount of sleep time per night spent by community college students during a academic term? a) The data give...
Question 202.5 pts If we consider the simple random sampling process as an experiment, the sample...
Question 202.5 pts If we consider the simple random sampling process as an experiment, the sample mean is _____. Group of answer choices always zero known in advance a random variable exactly equal to the population mean Flag this Question Question 212.5 pts The basis for using a normal probability distribution to approximate the sampling distribution of x ¯ and p ¯ is called _____. Group of answer choices The Law of Repeated Sampling The Central Limit Theorem Expected Value...
Suppose a university wishes to estimate the average weight of their undergraduate male students. A random...
Suppose a university wishes to estimate the average weight of their undergraduate male students. A random sample of 200 undergraduate male students at this university are sampled. It is found that the sample mean weight is 83.3 kg, with a corresponding 95% confidence interval for mu of (81.3, 85.3). Of the following options, which one is the most appropriate interpretation of that interval? We can be 95% confident that the sample mean weight of the 200 undergraduate male students in...
D Question 3 2 pts After collecting a random sample of 101 individuals living in Arizona,...
D Question 3 2 pts After collecting a random sample of 101 individuals living in Arizona, you find that the average income is $67,886. Using this sample, you determine that the 95% confidence interval for the sample mean is (61 881 73,891). Which of the following statements is correct? There is a 95% chance that the average income for the population of Arizona falls between $61,881 and S73,891 About 95% of the Arizona population have an income between $61,881 and...
3 Suppose a university wishes to estimate the average weight of their undergraduate male students. A...
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Suppose a university wishes to estimate the average weight of their undergraduate male students. A random sample of 200 undergraduate male students at this university are sampled. It is found that the sample mean weight is 83.3 kg, with a corresponding 95% confidence interval for mu of (81.3, 85.3). Of the following options, which one is the most appropriate interpretation of that interval? 95% of all male undergraduate students at this university weigh between 81.3 and 85.3 kilograms. In...
We considered the differences between the reading and writing scores of a random sample of 200...
We considered the differences between the reading and writing scores of a random sample of 200 students who took the High School and Beyond Survey in Exercise 5.21. The mean and standard deviation of the differences are x̄read-write = -0.545 and 8.887 points respectively. (a) Calculate a 95% confidence interval for the average difference between the reading and writing scores of all students. lower bound: points (please round to two decimal places) upper bound: points (please round to two decimal...
For Problem 1 and 2: A random sample of 16 graduates of a certain secretarial school...
For Problem 1 and 2: A random sample of 16 graduates of a certain secretarial school typed an average of 85 words per minute with a standard deviation of 8 words per minute. Assume that the number of words typed per minute of a randomly selected graduates follows a normal distribution 1. (4 pts) a 95% confidence interval to estimate the average number of words typed by all graduates of this school. Remember to state the assumptions and interpret the...
2. Suppose that a random sample of 41 state college students is asked to measure the...
2. Suppose that a random sample of 41 state college students is asked to measure the length of their right foot in centimeters. A 90% confidence interval for the mean foot length for students at this university turns out to be (21.709, 25.091). If we now calculated a 95% confidence interval, would the new confidence interval be wider than or narrower than or the same as the original? b. Suppose two researchers want to estimate the proportion of American college...
Spring break can be a very expensive holiday. A sample of 95 students is surveyed, and...
Spring break can be a very expensive holiday. A sample of 95 students is surveyed, and the average amount spent by students on travel and beverages is $593.84. The sample standard deviation is approximately $369.34. Construct a 90% confidence interval for the population mean amount of money spent by spring breakers.
A random sample of community college students was asked the number of hours they sleep on a typical week-night during a given academic term. The sample data are as follows: 8 6 4 5 3 7 S 4 3 4 4 5 6 8 7 7 7 3 3 4 What is the 90% confidence interval estimate for the true mean amount of sleep time per night spent by community college students during a academic term? a) The data give...
Suppose a university wishes to estimate the average weight of their undergraduate male students. A random sample of 200 undergraduate male students at this university are sampled. It is found that the sample mean weight is 83.3 kg, with a corresponding 95% confidence interval for mu of (81.3, 85.3). Of the following options, which one is the most appropriate interpretation of that interval? We can be 95% confident that the sample mean weight of the 200 undergraduate male students in...
D Question 3 2 pts After collecting a random sample of 101 individuals living in Arizona, you find that the average income is $67,886. Using this sample, you determine that the 95% confidence interval for the sample mean is (61 881 73,891). Which of the following statements is correct? There is a 95% chance that the average income for the population of Arizona falls between $61,881 and S73,891 About 95% of the Arizona population have an income between $61,881 and...
3
Suppose a university wishes to estimate the average weight of their undergraduate male students. A random sample of 200 undergraduate male students at this university are sampled. It is found that the sample mean weight is 83.3 kg, with a corresponding 95% confidence interval for mu of (81.3, 85.3). Of the following options, which one is the most appropriate interpretation of that interval? 95% of all male undergraduate students at this university weigh between 81.3 and 85.3 kilograms. In...
For Problem 1 and 2: A random sample of 16 graduates of a certain secretarial school typed an average of 85 words per minute with a standard deviation of 8 words per minute. Assume that the number of words typed per minute of a randomly selected graduates follows a normal distribution 1. (4 pts) a 95% confidence interval to estimate the average number of words typed by all graduates of this school. Remember to state the assumptions and interpret the...
2. Suppose that a random sample of 41 state college students is asked to measure the length of their right foot in centimeters. A 90% confidence interval for the mean foot length for students at this university turns out to be (21.709, 25.091). If we now calculated a 95% confidence interval, would the new confidence interval be wider than or narrower than or the same as the original? b. Suppose two researchers want to estimate the proportion of American college...
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