Twenty-three car salespeople were sampled to see how many cars they sold in a month; thefollowing data was obtained:29, 32, 28, 28, 32, 24, 21, 25, 28, 27, 21, 27, 26, 23, 30, 25, 30, 25, 35, 26, 22, 26, 20Assuming the population standard deviation is o = 4, construct a 87% confidence interval for themean number of cars sold per month by the population of car salespeople.I =a2OIN11.||Margin of Error: E =We are 87% confident that, on average, car salespeople sell betweenandcars per month.cars

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Answered: Twenty-three car salespeople were…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Twenty-one car salespeople were sampled to see how many cars they sold in a month; the following data was obtained:31, 28, 29, 29, 27, 24, 38, 30, 31, 27, 25, 35, 25, 30, 32, 30, 31, 29, 31, 23, 33Assuming the population standard deviation is σ=3, construct a 93% confidence interval for the mean number of cars sold per month by the population of car salespeople.xˉ=α2=zα2=Margin of Error: E=We are 93% confident that, on average, car salespeople sell between cars and cars per month.
The following sample data are from a normal population: 10, 8, 12, 15, 13, 11, 7, 4. a. What is the point estimate of the population mean? b. What is the point estimate of the population standard deviation (to 2 decimals)? c. With 95% confidence, what is the margin of error for the estimation of the population mean (to 1 decimal)? d. What is the 95% confidence interval for the population mean (to 1 decimal)?(______ , _______)
The following are standardized cognitive scores foryounger people andolder people: Younger 8, 6, 6, 7, 8, 7, 8, 8 Older 7, 5, 8, 5, 7, 6, 8, 5 Calculate SS, variance, and standard deviation forboth sets of people. Which group is more consistent?
calculate the standard deviation for the following sample data 2,4,5,5,7,8,9,10,11,12
A health researcher is interested in studying the work lives of physicians employed by health maintenance organizations (HMOs). Suppose that the following data depict the daily patient load (i.e., number of patients seen per day) of seven HMO physicians: 8, 7, 11, 4, 5, 13, 7 a. Compute mean, median, and mode for patient loads for the seven doctors. b. Compute the range of patients seen per day. c. Compute the standard deviation.
In a statistics class, 10 scores were randomly selected with the following results (mean = 71.5): 74, 73, 77, 77, 71, 68, 65, 77, 67, 66 What is the standard deviation?
A developmental psychologist is interested in studying how long babies gaze at a photograph of a human face. To test this question, she shows a picture to a sample of six babies and records the length of their gaze in seconds. The data are as follows: 12, 17, 18, 20, 20, 29. Calculate the mean, median, mode, range, variance and standard deviation for the sample.
Team A: 6,6,7,7,6,5,6,5,4,5 Team B: 2,2,3,8,9,9,9,9,10,10 a. Compute the mean number of shots made for each team b. Compute the standard deviation for each team c. Compute a Z-score for the individual from team A that made 4 shots d. Compute a Z-score for the individual from team B who made 10 shots e. Using non-statistical language, write several sentences describing the difference in the free-throw shooting abilities between the two teams
Previously, an organization reported that teenagers spend 12.5 hours per week, on average, on the phone. The organization thinks that, currently, the mean is lower. Twenty-three randomly chosen teenagers were asked how many hours per week they spend on the phone, with the following results (in hours): 10.4, 10.4, 17.3, 11.2, 10, 15.2, 9.5, 5.8, 12.5, 11.8, 7.3, 10.6, 11.5, 16.2, 16.5, 14.3, 12.3, 9.9, 13.7, 8.6, 11.3, 13, 16.5 Perform a hypothesis test using a 10% level of significance. Step 1: State the null and alternative hypotheses. Ho: pv 12.5 12.5 (So we will be performing a left-tailed Vv test.) Step 2: Assuming the null hypothesis is true, determine the features of the distribution of point estimates using the Central Limit Theorem. By the Central Limit Theorem, we know that the point estimates are t-distributed with distribution mean and distribution standard deviation Step 3: Find the p-value of the point estimate. = P(tv sv p-value = Step 4: Make a Conclusion About the nulI…
The following are the normalized levels of a critical protein in 12 samples of blood: 8.2 , 4.7 , 10.3 , 11.7 , 18.3 , 5.9 , 3.8 , 18.9 , 7.6 , 14.2 , 9.8 , 16.4 Compute the sample mean, the sample median, and the sample standard deviation.
The following sample data are from a normal population: 10, 9, 12, 14, 13, 11, 7, 4. a. What is the point estimate of the population mean? b. What is the point estimate of the population standard deviation (to 3 decimals)? c. With 95% confidence, what is the margin of error for the estimation of the population mean (to 1 decimal)? d. What is the 95% confidence interval for the population mean (to 1 decimal)?
A study is done to determine if students in the California state university (CSU) system take longer to graduate, on average, than students enrolled in private universities using the significant level of 5%. One hundred students from both the California state university system and private universities are surveyed. Suppose that from years of research, it is known that the population standard deviations are 1.5811 years for CSU and 1 year for private universities. The following data are collected. The California state university system students took on average 4.5 years with a standard deviation of 0.8. The private university students took on average 4.1 years with a standard deviation of 0.3. What is the decision rule of rejecting the null hypothesis

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