(16.19) A class survey in a large class for first-year college students asked, About how many hours do you study during a typical week? The mean response of the 463 students was x = 15.3 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation σ = 8.5 hours in the population of all first-year students at this university. Step 1: Use the survey result to give a 99% confidence interval for the mean...
A survey for first year (freshmen) asks how many minutes do you study on a typical weekday night? Mean response time of 269 students=137minutes. If you you know thestudy time has a normal distribution with a standard deviation of 65 minutes in the population of freshmen. Use the survey results to calculate a 99% confidenceinterval for the mean study time of all freshmen. What condition not yet mentioned must be met for your confidence interval to be valid?
Question 5 0.33 pts A survey asked the following question: "About how much time (in minutes) do you study on a typical weeknight?" to a randomly selected group of 46 first-year ASU students. The sample mean was 118 minutes. Let u be the mean study time of all first-year ASU students. Assume the population standard deviation is o = 65 minutes. Suppose you wanted to test is u is less than 2 hours: HO: u = 120 Ha: u <120...
A class survey in a large class for first-year college studentsasked, "About how many minutes do you study on a typicalweeknight?" The mean responce of the 269students was x bar= 137.Suppose that we know that the study time follows a Normaldistribution with standard deviation= 65 minutes. Regard thesestudents as an SRS fromthe population of all first-year studentsat this university. Does the study give good evidence that studentsclaim to study more than 2 hours per night onaverage?What is the p-value of...
31 stats students were asked how long it took them to finish the midterm exam. The sample mean was found to be 192 minutes and the sample standard deviation was 7 minutes. Create a 99% confidence interval for the population mean.
Construct a 99% confidence interval for the population mean, µ. Assume the population has a normal distribution. A group of 19 randomly selected students has a meanage of 22.4 years with a standard deviation of 3.8 years.?A.(19.9, 24.9)?B.(18.7, 24.1)?C.(16.3, 26.9)?D.(17.2, 23.6)
Construct a 99% confidence interval for the population mean, µ. Assume the population has a normal distribution. A group of 19 randomly selected students has amean age of 22.4 years with a standard deviation of 3.8 years.?A.(19.9, 24.9)?B.(18.7, 24.1)?C.(16.3, 26.9)?D.(17.2, 23.6)
Successful hotel managers must have personality characteristics often thought of as feminine (such as "compassionate") as well as those often thought of asmasculine (such as "forceful"). The Bem-Sex-Role Inventory (BSRI) is a personality test that gives separate ratings for female and male stereotypes, both on ascale of 1 to 7. A sample of 148 male general managers of three-star and four-star hotels had a mean BSRI masculinity score xbar=5.91. The standard deviation ofmasculinity scores for all adult males is standard...
5. The servicing time at the drive-through lane of a fast food restaurant follows an exponential distribution. The average servicing time is 2 minutes. (4 points) YORKVILLE BUSI 1013 statistics for Business What is the probability that it takes more than 2.5 minutes to service a customer at the drive-through lane? b. a. What percent of customers at the drive-through lane will take between 1 to 3 minutes to service? Part B 1. A simple random sample of 50 customers...
A student group claims that first-year students at a university must study 2.5 hours (150 minutes) per night during the school week. A skeptic suspects that they study less than that on the average. A class survey finds that the average study time claimed by 269 students is = 144 minutes, with a sample standard deviation of 70. A) Regard these students as a random sample of all first-year students and suppose we know that the study times follow a...
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