4. Interval estimation of a population mean, population standard deviation knownThe 2008 Workplace Productivity Survey, commissioned by LexisNexis and prepared by WorldOne Research, included the question, "How many work-related e-mails do you receive during the typical workday?" Let x = the number of work-related e-mails a legal professional receives during a typicalworkday. Suppose that x is normally distributed with a known standard deviation of 24.3.A sample of 250 legal professionals was surveyed, and the sample's mean response was 36.7 e-mails. Use the sample information to estimate µ, themean number of work-related e-mails a legal professional receives during a typical workday.The sampling distribution of X is normal with a meanand a standard deviationUse the following Distributions tool to develop a 95% confidence interval estimate of the mean number of work-related e-mails a legal professionalreceives during a typical workday.Select a DistributionDistributiọns0 1 2The 95% interval estimate of the population mean u is LCL =to UCL =

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Answered: 4. Interval estimation of a population…

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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2. Hypothesis: A one hour GRE workshop increases test scores. Sample Data: Mean of 25 people who did workshop = 156 (standard deviation = 8.2); mean of 27 people who did not do workshop = 154 (standard deviation 7.6).
If you periodically collect samples of 25 undergraduates, how much will the sample mean vary from one sample to the next?
The accompanying dala gives the results of a survey on the number of hours spent online per week on a certain social networking website. Determine if the mean number of hours spent online per week is the same for males as it is for females. Assume that the population variances are unequal Click the icon to view the social media survey data. Is there sufficient evidence at the 0.05 level of significance that the mean number of hours spent online per week is the same for males as it is for females? Determine the null hypothesis, Ho, and the alternative hypothesis, H₁. Let females be population 1 and males be population 2. Survey data Ho H₁ (Type integers or decimals. Do not round.) Gender Female Hours online/week Gender Hours online/week D 4 Male Female 11 Male Female 9 Male Female 8 Male Female 7 Male Female 13 Male Female 2 Male Female 6 Male Female 2 Male Female 6 Male Female 7 Make Female 3 Male Female Female Female Female Female Female Female Female 46021337 Mole 0653T50478145 8…
A team of ten (10) construction workers who are working on a project are classified according to the skill levels, Classes A to D. The table below shows the number of workers in each of the four (4) classes and their respective hourly pay-rate. Pay-rate (Rands/hour) Number of workers Class A 80 Class B 60 Class C 55 Class D 50 4. Calculate the mean hourly pay-rate for the 10 workers. A. R24.50/hour B. R57/hour C. R57.50/hour D. R61.75/hour
Bones Brothers & Associates prepare individual tax returns. Over prior years, Bones Brothers has maintained careful records regarding the time to prepare a return. The mean time to prepare a return is 90 minutes, and the population standard deviation of this distribution is 27 minutes. Suppose 100 returns from this year are selected and analyzed regarding the preparation time. What is the standard error of the mean? 27 minute 270 min 2.7 min 90 min
Using the R studio dataset: tsa <- read.csv("https://remiller1450.github.io/data/tsa.csv") From this dataset, take a sample of n = 10 claims. Record the mean Close Amount of this sample. Repeat this 500 times using a for-loop. What is the mean and the standard deviation of these 500 sample means. Draw a histogram (use freq = FALSE option) of these 500 sample means.
(b) Suppose that the measurement 37 (the largest measurement in the data set) were replaced by 69. Which measures of central tendency would be affected by the change? Choose all that apply. Mean Median Mode O None of these measures
F budy A consumer advocacy group is doing a large study on car rental practices. Among other things, the consumer group would like to do a statistical test regarding the mean monthly mileage, μ, of cars rented in the U.S. this year. The consumer group has good reason to believe that the mean monthly mileage of cars rented in the U.S. this year is greater than last year's mean, which was 2700 miles. The group plans to do a statistical test regarding the value of u. It chooses a random sample of monthly mileages and computes the mean of the sample to be 2800 miles and the standard deviation to be 750 miles. Based on this information, complete the parts below. (a) What are the null hypothesis Ho and the alternative hypothesis H₁ that should be used for the test? H₂ : Η H₁ :0 (b) Suppose that the group decides to reject the null hypothesis. What sort of error might it be making? (Choose one) ▼ (c) Suppose the true mean monthly mileage of cars rented in the U.S. this year is 2700. Fill in…
Bones Brothers & Associates prepare individual tax returns. Over prior years, Bones Brothers has maintained careful records regarding the time to prepare a return. The mean time to prepare a return is 90 minutes, and the population standard deviation of this distribution is 13 minutes. Suppose 100 returns from this year are selected and analyzed regarding the preparation time. What is the standard error of the mean? Multiple Choice 90 minutes 13 minutes 130 minutes 1.3 minutes
The ages of undergraduate students at two universities (one in the east and one in the west) are being compared. Researchers want to know if there is a difference in the mean age of students at the two universities. The population standard deviations are known. The following data shows the results of samples collected at each institution: School Location n (sample size) sample mean ( ) population standard deviation West 33 25.78 6.29 East 35 23.16 7.52 What is the value of the test statistic for the previous problem? (Enter your answer as a positive value even if you calculated a negative test statistic value i.e. if you calculated -1.311 you should enter 1.311). Round your answer to 3 decimal places.

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