Answered: As part of a research project, the…

As part of a research project, the masses, m grams, of a random sample of 1000 pebbles from a certain beach were recorded. The results are summarised in the table. Mass (g) 50 < m < 150 150

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 tin and zinc contents of a brass sample are analyzed with the following results yielded: a) Zn: 33.27, 33.37, and 33.34%; b) Sn: 0.022, 0.025 and 0.026% Which of the following is the correct mean value, the calculated standard deviation "s" and the coefficient of variation "cov" for Tin? (Answers in that sequence) mean-33.33%;s-0.052% and cov -0.16% mean-0.024%;s-0.032% and cov-5.3% mean-0.024%;s-0.0034% and cov - 7,5% mean-0.024%s-0.0021% mean-0.024%;s-0.0021% and cov-8.8% and cov can not be calculated from the data set supplied
The data used in the creation of the frequency table given below have been chosen to represent a continuous random variation by random sampling method. The random variable X represents the daily usage hours of tractors of a certain brand and engine power used in the agricultural sector. grp range grp limits grp midpoint Frequency 1-3 4 - 6 11th 7-9 14 10 - 12 13 - 15 16 - 18 a) Calculate the mean, median, mode, and variance values for the data using the table. 3,
A scientist studying babies born prematurely would like to obtain a n estimate for the mean birth weight.
Executives of a supermarket chain are interested in the amount of time that customers spend in the stores during shopping trips. The executives hire a statistical consultant and ask her to determine the mean shopping time, u, of customers at the supermarkets. The consultant will collect a random sample of shopping times at the supermarkets and use the mean of these shopping times to estimate u. Assuming that the standard deviation of the population of shopping times at the supermarkets is 27 minutes, what is the minimum sample size she must collect in order for her to be 99% confident that her estimate is within 5 minutes of u? Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements). (If necessary, consult a list of formulas.) ?
Let a population consist of the values 7 cigarettes, 21 cigarettes, and 22 cigarettes smoked in a day. Show that when samples of size 2 are randomly selected with replacement, the samples have mean absolute deviations that do not center about the value of the mean absolute deviation of the population. What does this indicate about a sample mean absolute deviation being used as an estimator of the mean absolute deviation of a population? Calculate the mean absolute deviation for each possible sample of size 2 from the population. Sample Mean Absolute Deviation {7,7} __ {7,21} __ {7,22} __ {21,7} __ {21,21} __ {21,22} __ {22,7} __ {22,21} __ {22 ,22}
Use the central limit theorem to find the mean and standard error of the mean of the indicated sampling distribution. Then sketch a graph of the sampling distribution. The per capita consumption of red meat by people in a country in a recent year was normally distributed, with a mean of 113 pounds and a standard deviation of 37.7 pounds. Random samples of size 20 are drawn from this population and the mean of each sample is determined.
Let a population consist of the values 11 cigarettes, 12 cigarettes, and 22 cigarettes smoked in a day. Show that when samples of size 2 are randomly selected with replacement, the samples have mean absolute deviations that do not center about the value of the mean absolute deviation of the population. What does this indicate about a sample mean absolute deviation being used as an estimator of the mean absolute deviation of a population? Calculate the mean absolute deviation for each possible sample of size 2 from the population. Mean Absolute Deviation Sample {11,11} {11,12} {11,22} {12,11} {12,12} {12,22} {22,11} {22,12} {22,22} (Type integers or decimals rounded to one decimal place as needed.) Budget Pi nd Pow....P Enter your answer in the edit fields and then click Check Answer. Clear All Check Answer parts
Listed in the data table are amounts of strontium-90 (in millibecquerels, or mBq, per gram of calcium) in a simple random sample of baby teeth obtained from residents in two cities. 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. Complete parts (a) and (b) below. City #1 City #2102 11786 78121 100113 85101 85104 107213 110100 111290 130100 133282 101145 209 Construct a confidence interval suitable for testing the claim that the mean amount of strontium-90 from city #1 residents is greater than the mean amount from city #2 residents. _____mBq<μ1−μ2<____mBq
Researchers conducted a study to determine whether magnets are effective in treating back pain. Pain was measured using the visual analog scale, and the results shown below are among the results obtained in the study. Higher scores correspond to greater pain levels. 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) to (c) below. Reduction in Pain Level After Magnet Treatment (1): n=22,x=0.58, s=0.89 Reduction in Pain Level After Sham Treatment (H2): n=22, x = 0.51, s = 1.29 H₁: H1 H2 The test statistic, t, is 0.21. (Round to two decimal places as needed.) The P-value is 0.417. (Round to three decimal places as needed.) State the conclusion for the test. OD. Ho H₁₂ H₁: H1 H2 Fail to reject the null hypothesis. There is not sufficient evidence to support the claim that those treated with magnets have a greater mean reduction in pain than…
Nine diodes were sampled to measure the manufactured diode's forward voltage as shown in the table below. Use these data to calculate three interval types (shown below. For all computations, assume an approximately normal distribution. The mean sample and standard deviation for the given data are x =0.7 V and s=0.1 V. Forward Voltage Drop of a Diode (V) 0.7489 0.8035 0.7727 0.6697 0.7294 0.7489 0.6213 0.7888 0.5853 0.5931 0.6213 Find the 99% tolerance limits that will contain 95% of the diodes manufactured.