Each car in a sample of seven cars was tested for nitrogen-oxide emissions (in grams per mile), and the following results were oblained0.04, 0.12, 0.17, 0.14, 0.13, 0.08, 0.14a. Assuming that this sample is representative of cars in use, construct a 95 % confidence interval estimate of the mean amount of nitrogen-oxide emissions for all cars(Round to the nearest thousandth as needed.)b. One agency requires that nitrogen-oxide emissions be less than 0.165 gram/ mile. Someone claims that nitrogen-oxide emissions have a mean equal to 0.165 gram/mile. Does the confidence interval suggest that this claim is not valid?NoYesO O

Enter the data in excel as shown below and the following formula to get the mean, standard deviation…

Answered: Each car in a sample of seven cars was…

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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A physicist examines 4 seawater samples for lead concentration. The mean lead concentration for the sample data is 0.890 cc/cubic meter with a standard deviation of 0.0312. Determine the 80 % confidence interval for the population mean lead concentration. Assume the population is approximately normal. Step 1 of 2: Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.
The blood platelet counts of a group of women have a bell-shaped distribution with a mean of 245.4 and a standard deviation of 63.6. (All units are 1000 cells/μL.) Using the empirical rule, find each approx. percentage below. a. What is the approx. percentage of women with platelet counts within 3 standard deviations of the mean, or between 54.6 and 436.2? b. what is the approx. percentage of women with platelet counts between 118.2 and 372.6?
The times for the mile run of a large group of college male students are approximately Normal with mean µ = 7.11 minutes and standard deviation o = 0.74 minutes. Use a table of areas to answer the following: (a) What percent of these men run a mile between 7.11 minutes and 8 minutes? (b) What percent of these men run a mile in under 5 minutes? (c) What percent of these men ran the mile in over 9 minutes? (d) What percent of these men run a mile between 7 minutes to 8 minutes?
Here are summary statistics for randomly selected weights of newborn girls: n= 36, x = 3180.6 g, s = 700.5 g. Use a confidence level of 95% to complete parts (a) thrargh (o below. a. Identify the critical value ta/2 used for finding the margin of error. ta/2= 2.03 (Round to two decimal places as needed.) b. Find the margin of error. E= 6. (Round to one decimal place as needed) Help me solve this View an example Get more help- Clear all Check Newt Previous
Here are summary statistics for randomly selected weights of newborn girls: n = 36, x= 3216.7 g, s = 688.5 g. Use a confidence level of 99% to complete parts (a) through (d) below. a. Identify the critical value to/2 used for finding the margin of error. ta/2 (Round to two decimal places as needed.) b. Find the margin of error. = = g (Round to one decimal place as needed.) c. Find the confidence interval estimate of μ. g<μ< g (Round to one decimal place as needed.) d. Write a brief statement that interprets the confidence interval. Choose the correct answer below. O A. One has 99% confidence that the sample mean weight of newborn girls is equal to the population mean weight of newborn girls. B. Approximately 99% of sample mean weights of newborn girls will fall between the lower bound and the upper bound. C. One has 99% confidence that the interval from the lower bound to the upper bound contains the true value of the population mean weight of newborn girls. D. There is a 99% chance…
The mean consumption of water per household in a city was 1244 cubic feet per month. Due to a water shortage because of a drought, the city council campaigned for water use conservation by households. A few months after the campaign was started, the mean consumption of water for a sample of 96 households was found to be 1164 cubic feet per month. The population standard deviation is given to be 257 cubic feet. a. Find the p-value for the hypothesis test that the mean consumption of water per household has decreased due to the campaign by the city council. Would you reject the null hypothesis at a = 0.025? Round your answer to four decimal places. p-value = We i b. Make the test of part a using the critical-value approach and a = 0.025. Zobserved Round your answer for z to two decimal places. We Ho. i Ho. We conclude that the mean consumption of water per household has due to the campaign by the city council.
Mrs. Gallas wanted to estimate the average weight of an Oreo cookie to determine if theaverage weight was less than advertised. She selected a random sample of 30 cookies andfound the weight of each cookie (in grams). The mean weight was = 11.1921 grams with astandard deviation of sx = 0.0817 grams. Make a 95% confidence interval to estimate the truemean weight of an Oreo. 1. What is the formula for calculating the standard deviation of the sampling distribution of x? 2.What condition must be met to use this formula? Has it been met?
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The body temperatures of a group of healthy adults have a bell-shaped distribution with a mean of 98.39°F and a standard deviation of 0.56°F. Using the empirical rule, find each approximate percentage below. a. What is the approximate percentage healthy adults with body temperatures within 2 standard deviations of the mean, or between 97.27°F and 99.51°F? b. What is the approximate percentage of healthy adults with body temperatures between 96.71°F and 100.07°F? a. Approximately % of healthy adults in this group have body temperatures within 2 standard deviations of the mean, or between 97.27°F and 99.51°F. (Type an integer or a decimal. Do not round.) b. Approximately% of healthy adults in this group have body temperatures between 96.71°F and 100.07°F. (Type an integer or a decimal. Do not round.)
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The body temperatures of a group of healthy adults have a bell-shaped distribution with a mean of 98.33°F and a standard deviation of 0.52°F. Using the empirical rule, find each approximate percentage below a. What is the approximate percentage of healthy adults with body temperatures within 3 standard deviations of the mean, or between 96.77F and 99.89°F? b. What is the approximate percentage of healthy adults with body temperatures between 97.29°F and 99.37°F? a. Approximately% of healthy adults in this group have body temperatures within 3 standard deviations of the mean, or between 96.77°F and 99.89°F. (Type an integer or a decimal. Do not round.)

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