In a first grade class, 9 of 24 students drink white milk with their lunch. Find the 92% confidence interval for students drinking milk.
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In a first grade class, 9 of 24 students drink white milk with their lunch. Find...
The average time to drive from Joliet to Chicago in non-rush hour traffic on I 55 is 48 minutes with a sample standard deviation of 6.3 minutes. For n = 65, find the 95% confidence interval for the mean. Meijer has 10 lbs. of potatoes on sale for Thanksgiving. If the bags have a population standard deviation of .75 lbs., find the 90% confidence interval for the mean for n = 50. At JJC, 125 out of 200 students take...
1. In a recent study of 39 ninth-grade students, the mean number of hours per week that they played video games was 86.6. The standard deviation of the sample was 3.8. a. Find the best point estimate of the population mean. b. Find the 90%confidence interval of the mean of the time playing video games. c. Find the 96% confidence interval of the mean of the time playing video games. d. Find the 98% confidence interval of the mean of...
the average grade of a group of 24 alegbra students is 85%, and the standard deviation is known to be 4%, find the 95% confidence interval for the true mean of the grades
9. A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spent studying per week. Assuming a population standard deviation of three hours, what is the required sample size if the error should be less than a half hour with a 99% level of confidence? 10.University officials say that at least 70% of the voting student population supports a fee increase. If the 95% confidence interval estimating the...
Suppose we are interested in the number of hours per week that first year Carleton students play video games. This distribution of time has been historically skewed to the right. A simple random sample of 140 such students gave a mean of 12.2 hours and a standard deviation of 3.6 hours. Compute a 99% CI for the number of hours an average first year Carleton student plays video games.
1) Data was gathered from several professional golfers in order to determine if there is a relationship between average driving distance (in yards) and accuracy (in percentage). This data is presented in the scatterplot below. Suppose we go on to compute the correlation coefficient, r. In this example, the units of r would be what? A. There are no units B. Yards C. Percentage D. Yards per percentage E. Percentage per yard 2. In a study of academic achievement within...
The state education commission wants to estimate the fraction of tenth grade students that have reading skills at or below the eighth grade level. Step 1 of 2: Suppose a sample of 16491649 tenth graders is drawn. Of the students sampled, 379379 read at or below the eighth grade level. Using the data, estimate the proportion of tenth graders reading at or below the eighth grade level. Enter your answer as a fraction or a decimal number rounded to three...
. An educational researcher sought to estimate the average number of close friends that students on a particular campus made during their first year of school. Questioning a random sample of 50 students completing their freshman year, he finds a sample mean of 3 close friends. Assume the population standard deviation is 1. Construct a 95 percent confidence interval to estimate the mean number of close friends made by the population of college students during their first year on campus....
1. To determine the average number of hours spent studying by college students per week, a sample of 39 students was randomly selected, and found to spend an average of 17.1 hours per week, with a standard deviation of 4.3 hours. Find the 90% confidence interval for the mean number of hours spent studying per week by all college students. What is the upper and lower bound? 2. If I asked a random student how many hours they study per...
Based on a random sample of 20 students from a PE class, they exercise 1.6 hours (96 minutes) per day on average with sample standard deviation 1.23 hours (78 minutes). Use this information to construct a 95% confidence interval to estimate μ, the population mean number of hours of daily exercise for students. a. State the assumption(s) b. identify whether each assumption is met or not. c. Show your work to calculate the confidence interval and d. interpret the result in...