Part E - Area Under the Curve (possible 12 points) 2 Activity: In the field of statistics the fun...
1. Find z such that 70% of the standard normal curve lies between −z and z. (Round your answer to two decimal places.) 2. The Customer Service Center in a large New York department store has determined that the amount of time spent with a customer about a complaint is normally distributed, with a mean of 9.3 minutes and a standard deviation of 2.3 minutes. What is the probability that for a randomly chosen customer with a complaint, the amount...
1 2 3 5 6 The scores on an examination in psychology are approximately normally distributed with mean 500 and an unknown standard deviation. The following is a random sample of scores from this examination 410,438, 469, 501, 527, 539,586 Find a 90% confidence interval for the population standard deviation. Then complete the table below Carry your intermediate computations to at least three decimal places. Round your answers to at least two decimal places What is the lower limit of...
Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 65 students in the highest quartile of the distribution, the mean score was x = 175.50. Assume a population standard deviation of σ = 7.59. These students were all classified...
Please help with 5,6,7, please show your work as well! 10 out of 10 points Question 1 A population has a mean of 60 and a standard deviation of 30. Samples of size 16 are randomly selected. Calculate the standard deviation of the sample distribution of X. Round off to 3 decimal places. 15 out of 15 points Question 2 Samples of size 16 are drawn from a population. The sampling distribution for X has a standard deviation of 0.25....
Can you answer questions 2,3,4 &show work 10 out of 10 points Question 1 A population has a mean of 60 and a standard deviation of 30. Samples of size 16 are randomly selected. Calculate the standard deviation of the sample distribution of X. Round off to 3 decimal places. 15 out of 15 points Question 2 Samples of size 16 are drawn from a population. The sampling distribution for X has a standard deviation of 0.25. Find the standard...
Please answer all of the following. The boxplot below shows the number of contacts in their cell by gender for my Spring 2018 statistics classes. Using the boxplot, answer the 4 questions below. Boxplot of CellNumbers 900 800 700 600 500 400 300 200 100 0 Male Female Gender CellNumbers Which distribution has 3 outliers? Which distribution appears skewed right, excluding 1. Male 1 outliers? 2. Female Which distribution is 1 3. Both less variable (has the smaller IQR)? 4....
nts, under any circumstances . You can only upload ONE combined file. . You must ALWAYS show all your work! For example, if I was going to answer the following question, here is how I would show my work: Question: Find the mean of the following data set (2,3.4,5,6 Answer Step 1: 2+3+4+5+6 20 Step 2: 20/5-4 Step 3: Mean 4 LabAssignment#2 Z-scores, Sampling Distributions, and the Central Limit Theorem Note: Be sure to label your answers with the correct...
a) Sketch the area under the standard normal curve over the indicated interval and find the specified area. (Round your answer to four decimal places.) The area to the right of z = 1.51 is ____ b) The Customer Service Center in a large New York department store has determined that the amount of time spent with a customer about a complaint is normally distributed, with a mean of 9.5 minutes and a standard deviation of 2.1 minutes. What is...
please who can answer this question 10. A statistics instructor is interested in comparing the final grades for his introductory course with the final grades for all of the introductory statistics courses at Brandon University in the past ten years. The final grades for his class form a normal distribution with a x= 75 and as= 10. The final grades for all of the introductory statistics courses also form a normal distribution, but with a u = 60 and a...
PU Math 80 - Statistics Central Limit Theorem for Sample Proportions Handout 5.2 2 ES school 0.5. schools face an ongoing challenge: as students get closer to high school graduation, their enthusiasm for school falls. A Gallup poll in June 2017 has discovered that fifth graders are most engaged with school, while 11th graders are least. The latest Gallup poll showed that only 32% of 11th graders are engaged in school. Assume this value represents the population proportion. Suppose we...