20 The weekly demand for a particular product in a white-goods store is thought to benormally distributed. Use a goodness of fit test and the following data to test thisassumption. Use a=0.10. The sample mean is 24.5 and the sample standarddeviation is 3.0.XSdn=30182626202325222031272429222625Total 100252725222528271926252128242524ei

The objective of the question is to test the assumption that the weekly demand for a particular…

Answered: 20 The weekly demand for a particular…

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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Listed below are the numbers of hurricanes that occurred in each year in a certain region. The data are listed in order by year. Find the range, variance, and standard deviation for the given sample data. Include appropriate units in the results. What important feature of the data is not revealed by any of the measures of variation? 19 14 9 3 10 15 20 4 10 20 14 6 16 13 The range of the sample data is nothing ▼ years.years. hurricanes squared .hurricanes2. years squared .years2. hurricanes.
Use the grouped data formulas to find the indicated mean or standard deviation. The speeds of a random sample of 100 cars are recorded as they pass a highway checkpoint. The results are summarized in the frequency distribution below. Approximate the sample mean. Speed (mph) Cars 30-39 6 40-49 15 50-59 51 5553 O 55.9 mph O 58.7 mph O 54.5 mph O 61.5 mph 60-69 70-79 13 15 22
An experiment was conducted to determine whether giving candy to dining parties resulted in greater tips. The mean tip percentages and standard deviations are given in the accompanying table along with the sample sizes. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b). OA. Ho: H₁ H₂ H₁: H₁ H₂ OC. Ho: H₁ H₁: H₁ C a. Use a 0.05 significance level to test the claim that giving candy does result in greater tips. What are the null and alternative hypotheses? H₂ H₂ No candy Two candies B. Ho: M₁ = H₂ H₁: H₁ H₂ D. Ho: H₁ μ H₁ H₂ H₂ H₁: M₁
Weights of women in one age group are normally distributed with a population standard deviation of 14 lb. A researcher wishes to estimate the mean weight of all women in this age group. Find how large a sample must be drawn in order to be 90% confident that the sample mean will not differ from the population mean by more than 3.0 lb. O a. 59 O b. 84 O c. 60 O d. 57
Consider the following sample data. Sample A: 5, 8, 11 Sample B: 64, 67, 70 Sample C: 1,015; 1,018; 1,021 (a) Find the mean and standard deviation for each sample. (b) What does this exercise show about the standard deviation? multiple choice The idea is to illustrate that the standard deviation is not a function of the value of the mean. The idea is to illustrate that the standard deviation is a function of the value of the mean.
Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. A researcher was interested in comparing the GPAs of students at two different colleges. Independent simple random samples of 8 students from college A and 13 students from college B yielded the following GPAs. College A 3.7 3.2 3.0 2.5 2.7 3.6 2.8 3.4 College B 3.8 3.2 3.0 3.9 3.8 2.5 3.9 2.8 4.0 3.6 2.6 4.0 3.6 Construct a 95% confidence interval for μ1−μ2, the difference between the mean GPA of college A students and the mean GPA of college B students. Round to two decimal places. (Note: x1=3.1125, x2=3.4385, s1=0.4357 s2=0.5485
Test the claim below about the mean of the differences for a population of paired data at the level of significance a. Assume the samples are random and dependent, and the populations are normally distributed
Concrete formulated for use in commercial structures is designed to withstand pressures of 4000 pounds per square inch. The data set below represents the strength of 20 randomly selected samples of concrete. Click on the Data button shown below to display the data and copy and paste it into a statistical software package. Then compute the mean and standard deviation rounding your answers to 1 decimal place.Data Strength 4053 4223 4186 4322 4017 4169 4100 4003 4309 4086 3923 4440 3977 4270 3984 4136 3925 4204 4112 4305 Mean Standard deviation

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