4. (0) If there are 100 students are in a class room how many of them...
A class of 22 students, 7 are seniors and 15 are juniors. In how many ways can we choose a group of 6 people if. . . (a) three are to be selected from seniors and three from juniors? (b) at least three are to be selected from juniors? (c) Ashley (one of the 22 students) must be included in the group (with no additional requirements)? (d) 3 of the selected students must be assigned the jobs of writer, presenter,...
In a randomly selected 100 students in a large college, 20 of them had at least one sibling. Does this provide strong evidence that more than 15% of college students in America have at least one sibling? Find the value of the test statistic (round off to first decimal place)
(8 points) How many people must be in a room to ensure that at least two of them were born on the same day of the week? How many to ensure that at least five of them were born on the same day of the week?
You are working on an assignment for your statistics class. You need to E Select one answer. estimate the proportion of students at your college who delay taking their first 10 points math class for at least one year. Which sampling plan will produce the most reliable results? A. Obtain a list of all students enrolled at the college. Randomly select 100 students from the list. B. O Work with the math instructors to create a list of students currently...
16.19) A class survey in a large class for first-year college students asked, "About how many hours do you study in a typical week?". The mean response of the 452 students was x¯¯¯ = 13 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation 7 hours in the population of all first-year students at this university. What is the 99% confidence interval (±0.001) for the population mean? Confidence interval is from to hours.
1. 2. 3. A drawer contains black, brown, and white socks. How many socks ensure two of the same color? With 2,0,3 and 6 how many three digits even numbers can be generated without replacements? We selected 20 persons by the random. What is the probability that only 3 of them have the same birthday at August? Find the probability that only 3 of them have the common month for their birthday? Question 3. (20 pts.) 1. A drawer contains...
In a group of 17 students, there are 3 freshman. How many different ways can 3 students be chosen from the group if at least one of them must be a freshman?
A class survey in a large class for first-year college students asked, "About how many minutes do you study on a typical weeknight?" The mean response of the 300 students was x⎯⎯⎯x¯ = 149 minutes. Suppose that we know that the study time follows a Normal distribution with standard deviation σσ = 65 minutes in the population of all first-year students at this university. Use the survey result to give a 96% confidence interval for the mean study time of...
How many business students must be randomly selected to estimate the mean monthly earnings of business students at one college? We want 95% confidence that the sample mean is within $131 of the population mean, and the population standard deviation is known to be $529.
(16.19) A class survey in a large class for first-year college students asked, "About how many hours do you study in a typical week?". The mean response of the 434 students was x¯¯¯x¯ = 12 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation 8 hours in the population of all first-year students at this university. What is the 99% confidence interval (±±0.001) for the population mean? Confidence interval is from ___to ___...