Provide an appropriate response. The grade point averages of students participating in sports at a local...
Provide an appropriate response. The grade point averages for 10 randomly selected students in a statistics class with 125 students are listed below. What can you say about the mean score u of all 125 students? 3.6 2.6 2.0 2.1 2.7 3.4 2.9 1.9 3.9 3.7
Recent research indicates that the effectiveness of antidepressant medication is directly related to the severity of the depression (Khan, Brodhead, Kolts & Brown, 2005). Based on pretreatment depression scores, patients were divided into four groups based on their level of depression. After receiving the antidepressant medication, depression scores were measured again and the amount of improvement was recorded for each patient. The following data are similar to the results of the study. Low Moderate High Moderate Moderately Severe Severe 1.2...
Parametirc test or not:Test statistic:p-value:decision:Is There A Difference Between the Means?6.7 6.2 3.1 310.3 10 5 5.56.9 5.5 3.3 3.110.5 6.3 4.3 5.44.5 4.6 1.8 25.6 5.6 2 2.65.9 6.1 2.1 2.58 11.7 4 4.68 7.4 3.3 3.15.8 5.2 3.1 2.96 7.3 3.0 3.28.7 5.3 2.7 36 5.5 2.1 2.27.2 6.3 3.5 3.25.9 4.6 2.9 3.46 7.4 3 3.37.2 7.8 3.7 3.48.6 9.4 5.1 5.77.2 8.1 2.8 3.15.8 5.4 2.2 1.83.3 4 1.7 1.86.8 5.1 2 1.83.7 3.5 2.2 2.112...
The grade point averages (GPA) for 15 randomly selected college students are: 2.3 3.3 2.6 1.8 0.2 3.1 0.7 4.0 2.3 2.0 3.1 3.4 13 26 26 Which of the following is the correct confidence interval procedure for a 95% confidence level?
First-semester GPAs for a random selection of freshmen at a large university are shown below. 1.9 3.2 2.0 2.9 2.7 3.3 2.8 3.0 3.8 2.7 2.0 1.9 2.5 2.7 2.8 3.2 3.0 3.8 3.1 2.7 3.5 3.8 3.9 2.7 2.0 2.8 1.9 4.0 2.2 2.8 2.1 2.4 3.0 3.4 2.9 2.1 (a) (3 points) Estimate the true mean GPA of the freshman class with 99% confidence. Assume σ = 0.62, based on prior year results. (b) (1 point) What is...
A sociologist claims that children spent more time watching television in 1981 than children do today. A study was conducted in 1981 to find the time that children watched television on weekdays. Recently, a similar study was conducted. The results of these studies (in hours per weekday are shown below. Assume the population standard deviation is 0.7 for 1981 and 0.8 for today, At a = 0.05, can you support the sociologist's claim? Complete parts (a) through (d) below. Full...
Use only Minitab if you won't use Minitab leave it for another person to work on it please. The breaking strengths of carbon fibers, which are used in fibrous composite materials, were measured by randomly selecting samples of 5 fibers. See attached data spreadsheet contains the data. a. Form an x-bar/R chart. b. Based on your answer to part a, would you say that the process is in control, or 1. not? Explain your answer. Also, discuss anything unusual that...
The grade point averages (GPA) of 18 randomly selected college students are used to estimate the mean GPA of the college students. The GPAs from the sample are as follows: 2.3 3.3 2.6 1.8 0.2 3.1 4.0 0.7 3.1 2.3 2.0 3.1 3.4 1.3 2.6 2.6 3.7 2.2 (5 points) Is it justified to use of the standard normal distribution to construct the confidence interval? Explain. (10 points) If the population is assumed to be normally distributed, construct a 98% confidence interval for the population mean GPA. Show your work in detail and use 3...
Single data values (in hours): 3, 1, 4, 5, 5, 2, 2.5, 3.5, 4, 4.5, 0, 2, 2, 2.5, 3.5, 4, 4, 4, 4, 2, 3.5, 3.5, 2, 3, 4, 4, 3, 3, 3, 1 Paired data values: Athletes Non-athletes 3.7 2.5 3.1 4.1 4.2 4.2 4.2 4.2 3.4 3.0 3.7 3.8 2.1 2.1 3.5 2.7 3.6 1.8 4.0 2.0 2.9 3.6 3.2 3.9 2.9 2.6 3.5 2.8 3.6 3.1 3.4 3.5 2.9 3.5 3.9 3.6 2.8 2.9 3.1 2.7...
A sociologist claims that children spent more time watching television in 1981 than children do today. A study was conducted in 1981 to find the time that children watched television on weekdays. Recently, a similar study was conducted. The results of these studies (in hours per weekday) are shown below. Assume the population standard deviation is 0.7 for 1981 and 0.7 for today. At α=0.05, can you support the sociologist's claim? Complete parts (a) through (d) below. Full data set...