Twenty years ago, 48% of parents of children in high school felt it was a serious problem that high school students were not being taught enough math and science. A recent survey found that 297 of 900 parents of children in high school felt it was a serious problem that high schoolstudents were not being taught enough math and science. Do parents feel differently today than they did twenty years ago? Use the α = 0.05 level of significance.Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2).Because npo (1-Po)10, the sample size is(Round to one decimal place as needed.)=5% of the population size, and the samplethe requirements for testing the hypothesis▼satisfied.

Sample size, The Number of parents of children in high school who felt students were not taught…

Answered: Twenty years ago, 48% of parents of…

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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The height of women ages 20-29 is normally distributed, with a mean of 64.7 inches. Assume o = 2.5 inches. Are you more likely to randomly select 1 woman with a height less than 65.6 inches or are you more likely to select a sample of 21 women with a mean height less than 65.6 inches? Explain. ⠀ Click the icon to view page 1 of the standard normal table. Click the icon to view page 2 of the standard normal table. What is the probability of randomly selecting 1 woman with a height less than 65.6 inches? (Round to four decimal places as needed.) is Get more help - Q Search ly HO S O Clear all Check answer
The height of women ages 20-29 is normally distributed, with a mean of 63.5 inches. Assume o =2.4 inches. Are you more likely to randomly select 1 woman with a height less than 64.5 inches or are you more likely to select a sample of 17 women with a mean height less than 64.5 inches? Explain. Click the icon to view page 1 of the standard normal table. Click the icon to view page 2 of the standard normal table. What is the probability of randomly selecting 1 woman with a height less than 64.5 inches? (Round to four decimal places as needed.) What is the probability of selecting a sample of 17 women with a mean height less than 64.5 inches? (Round to four decimal places as needed.) Are you more likely to randomly select 1 woman with a height less than 64.5 inches or are you more likely to select a sample of 17 women with a mean height less than 64.5 inches? Choose the correct answer below. A. It is more likely to select a sample of 17 women with a mean height less than 64.5 inches…
The height of women ages 20-29 is normally distributed, with a mean of 63.9 inches. Assume o = 2.5 inches. Are you more likely to randomly select 1 woman with a height less than 65.6 inches or are you more likely to select a sample of 16 women with a mean height less than 65.6 inches? Explain. Click the icon to view page 1 of the standard normal table. Click the icon to view page 2 of the standard normal table. What is the probability of randomly selecting 1 woman with a height less than 65.6 inches? (Round to four decimal places as needed.) What is the probability of selecting a sample of 16 women with a mean height less than 65.6 inches? (Round to four decimal places as needed.) Are you more likely to randomly select 1 woman with a height less than 65.6 inches or are you more likely to select a sample of 16 women with a mean height less than 65.6 inches? Choose the correct answer below. A. It is more likely to select 1 woman with a height less than 65.6 inches because the probability…
Forest rangers believe that 30% of trees in a large national forest have a leaf fungus. A survery team will inspect a sample of 200 trees. a. Show the steps needed to justify and use a normal model to describe the percentage of fungus-infected trees that may appear in this sample. b. What proportion of infected trees in this sample would lead you to believe the true proportion of ifected trees is higher than the rangers believe?
Suppose that a committee is studying whether or not there is waste of time in our judicial system. It is interested in the mean amount of time individuals waste at the courthouse waiting to be called for jury duty. The committee randomly surveyed 81 people who recently served as jurors. The sample mean wait time was 8 hours with a sample standard deviation of 4.6 hours. 1. Which distribution should you use for this problem? Explain your choice. a. The standard Normal distribution should be used because the population standard deviation is known. b. The Student's tt-distribution for 81 degrees of freedom should be used because we do not know the population standard deviation. c. The Student's tt-distribution for 80 degrees of freedom should be used because we do not know the population standard deviation. d. The standard Normal distribution should be used because the sample standard deviation is known.\ 2. Construct a 95% confidence interval for the…
8. For a right-skewed distribution, which is greater: the mean or the median? Give a brief but specific explanation of your reasoning. Sketch a right-skewed distribution, labeling the mean and median for the distribution of a population.
A successful basketball player has a height of 6 feet 11 inches, or 211 cm. Based on statistics from a data set, his height converts to the z score of 5.17. How many standard deviations is his height above the mean?
The Mathematics section of the ACT test had a mean of 20.9 and an SD of 5.3 for the years 2013–2015. Suppose these are well modeled by a Normal distribution. a) About what percent of students scored over 33? b) About what percent of students scored under 16? c) About what percent of students scored between 16 and 33?
A successful basketball player has a height of 6 feet 3 inches, or 191 cm. Based on statistics from a data set, his height converts to the z score of 2.31. How many standard deviations is his height above the mean?
Recently, a random sample of 13–18 year olds was asked, "How much do you currently have in savings?" The data in the table represent the responses to the survey. Approximate the mean and standard deviation amount of savings. LOADING... Click the icon to view the frequency distribution for the amount of savings. Savings Frequency $0– $199 343 $200– $399 94 $400– $599 62 $600– $799 21 $800– $999 9 $1000– $1199 5 $1200– $1399 3 The sample mean amount of savings is $nothing. (Round to the nearest dollar as needed.) The sample standard deviation is $nothing. (Round to the nearest dollar as needed.)
a. (True or False) The weekly consumption of favorite beverages from this survey hasapproximately a normal distribution, explain your decision. b. Based on the histogram, which one is greater: mean or median? Explain why.c. Which summary statistic would be a better representation of the center for this sample:mean or median?
Inter-State Moving and Storage Company wishes to establish a control chart to monitor the proportion of residential moves that result in written complaints due to late delivery, lost items, or damaged items. A sample of 50 moves is selected for each of the last 12 months. The number of written complaints in each sample is 8, 7, 4, 8, 2, 7, 11, 6, 7, 6, 8, and 12. Click here for the Excel Data File a. Insert the mean proportion defective, UCL, and LCL. (Leave no cells blank - be certain to enter "O" wherever required. Round your Intermediate calculations and final answers to 2 decimal places.) Mean proportion defective UCL LCL c. Does it appear that the number of complaints is out of control for any of the months? O Yes O No MacBook Air

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