Question 5 of 11StackedExposure to dust at work can lead to lung disease later in life. One study measured the workplace exposure of tunnelconstruction workers. Part of the study compared 115 drill and blast workers with 220 outdoor concrete workers. Total dustexposure was measured in milligram years per cubic meter (mg-y/m³). The mean exposure for the drill and blast workers was18.0 mg y/m³ with a standard deviation of 7.8 mg-y/m³. For the outdoor concrete workers, the corresponding values were 6.5and 3.4 mg-y/m', respectively.Use Table D or your preferred software to determine the P-value.Select the correct P-value.O P-value < 0.001O P-value > 0.005O 0.0025 < P-value < 0.005O 0.001 < P-value < 0.0025

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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 relationship between birth weight and IQ were studied. 258 subjects with extremely low birth weights had Wechsler IQ scores at age 8 with a mean of 95.5 and a standard deviation of 16.0. For 220 individuals with normal birth weights, the mean at age 8 is 104.9 and the standard deviation is 13.8. Assume that the standard deviations are different, and determine if IQ score appears to be affected by birth weight. Use a = 0.1. 2a. b. Compute a 95% confidence interval on the difference between the means.
The parts per million concentrations of a particular toxic substance in a wastewater steam is known to be normal distribution with mean 80 and standard deviation 2.75. The concentration of toxic pollutants corresponding to 98 percentile is
Show that the correlation coefficient is independent of the origin of reference and the units of measurement.
From generation to generation, the mean age when smokers first start to smoke varies. A survey of 20 smokers of this generation was done to see if the mean starting age was under 19 years old. The sample mean was 18.1 years old, with a sample standard deviation of 1.3 years. Is the data significant at α=.05%?
The scores on a psychology test were normally distributed with a mean of 65 and a standard deviation of 4. Use the Empirical Rule to find the percentage of scores above 69.
A water company wants to analyze the the level of a particular contaminant in a water supply. The contaminant level is to be checked at several locations. Assume that the observed contaminant level is normally distributed and that each observation is independent of the others. A scientist measures the contaminant level at 10 different locations in the water supply and finds the mean level of the substance is T = 120 parts per billion (ppb) with standard deviation s = 25 ppb. Estimate the true mean contaminant level in the water supply with a 99% upper confidence bound. Answer requires 2 decimal places accuracy.
The weight of potato chips in a large-size bag is stated to be 24 ounces. The amount that the packaging machine puts in these bags is believed to have a normal model with a mean of 24.2 ounces and a standard deviation of 0.12 ounces.
A taxicab company in New York City analyzed the daily number of miles driven by each of its drivers. It found the average distance was 200 mi with a standard deviation of 30 mi. Assuming a normal distribution, what prediction can we make about the percentage of drivers who will log in either more than 260 mi or less than 170 mi?
A study compared the weight loss of people on a low-fat diet versus people on a low-carb diet. In a sample of 100 obese people on a low-fat diet the sample mean weight loss as 7.6 pounds with a standard deviation of 3.2 pounds. In another sample of 120 obese people on a low-carb diet the sample mean weight loss was 6.7 pounds with a standard deviation of 3.9 pounds. Write down all formulas and state the hypothesisa) Test the hypothesis, at the 5% level of significance, that there is a difference in the mean weightloss of using the 2 different diets. b) What is the p-value?
The annual per capita consumption of oranges (in pounds) in the United States can be approximated by a normal distribution. The mean annual per capita of oranges is 19.2 with a standard deviation of 4 pounds. what annual per capita consumption of oranges represents the 5th percentile?
The compressive strength of samples of cement can be modelled by a normal distribution with a mean of 6000 kg/ sq cm and a standard deviation of 100 kg/sq cm. 1.What strength is exceeded by 95% of the strength?
A diabetic person is interested in determining how the amount of aerobic exercise impacts his blood sugar. When blood sugar reaches 170 mg/dl, he goes out for a run at a pace of 10 minutes per mile. On different days, he runs different distances and measures his blood sugar after completing his run. The preferred blood sugar level is in the range of 80 to120 mg/dl. Levels that are too low or too high are extremely dangerous. The data generated are given in the following table: Distance (miles),x Blood sugar(mg/dl gram),y 2 136 2 146 2.5 131 2.5 125 3 120 3 116 3.5 104 3.5 95 4 85 4 94 4.5 83 4.5 75 Based on the scenario above, analyse the data with appropriate statistical methods and describe your findings in details. Use alpha=0.05 [note: use hypothesis, test statistics confidence interval etc.] ]

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