An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed with a standard deviation of 45 hours. How large a sampleis needed if we wish to be 94% confident that our sample mean will be within 12 hours of the true mean?Click here to view page 1 of the standard normal distribution table.Click here to view page 2 of the standard normal distribution table.Click here to view page 1 of the table of critical values of the t-distribution.Click here to view page 2 of the table of critical values of the t-distribution......The required sample size is(Round up to the nearest whole number as needed.)

According to the given information, we have Standard deviation = 45 Confidence level = 94% Margin of…

Answered: An electrical firm manufactures light…

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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Salaries of 43 college graduates who took a statistics course in college have a mean, x, of $66,900. Assuming a standard deviation, o, of $12,687, construct a 90% confidence interval for estimating the population mean u. Click here to viewat distribution table. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. S
Salaries of 32 college graduates who took a statistics course in college have a mean, x, of $62,000. Assuming a standard deviation, 6, of $17,889, construct a 95% confidence interval for estimating the population mean µ. Click here to view at distribution table. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table.
It is claimed that the proportion of adults with at least one chronic disease in a certain country might be more than the reported number, which is only 25%. A random sample of 85 adults are surveyed, of which 28 are found to suffer from at least one chronic disease. Use a 0.01 level of significance to test the above claim. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard nomal distribution table. (a) Identify the null and alternative hypotheses. O A. H,: p= 0.25 against H,: p 0.25 OD. Hp: p>0.25 against H,: p=0.25 O E. H,:p= 0.25 against H,: p 0.25 OF. H:p OC. z (c) The z value for test can be calculated as (Round to two decimal places including any zeros.) (d) Make an appropriate conclusion. O A. Reject the null hypothesis because there is not significant evidence that more than 25% of the adults suffer from at least one chronic disease. O B. Do not reject the null hypothesis because there is not significant evidence that…
Salaries of 32 college graduates who took a statistics course in college have a mean, x, of $61,600. Assuming a standard deviation, o, of $11,936, construct a 99% confidence interval for estimating the population mean p. Click here to view a t distribution table. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. ..... $ <µ < $ (Round to the nearest integer as needed.)
The acceptable level for insect filth in a certain food item is 4 insect fragments (larvae, eggs, body parts, and so on) per 10 grams. A simple random sample of 60 ten-gram portions of the food item is obtained and results in a sample mean of x = 4.2 insect fragments per ten-gram portion. Complete parts (a) through (c) below. Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). (a) Why is the sampling distribution of x approximately normal? OA. The sampling distribution is approximately normal because the population is normally distributed and the sample size is large enough. B. The sampling distribution is approximately normal because the sample size is large enough. O C. The sampling distribution is assumed to be approximately normal. O D. The sampling distribution is approximately normal because the popluation is normally distributed. (b) What is the mean and standard deviation of the sampling…
The acceptable level for insect filth in a certain food item is 4 insect fragments (larvae, eggs, body parts, and so on) per 10 grams. A simple random sample of 60 ten-gram portions of the food item is obtained and results in a sample mean of x=4.5 insect fragments per ten-gram portion. Complete parts (a) through (c) below. Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). ... (a) Why is the sampling distribution of x approximately normal? A. The sampling distribution is approximately normal because the popluation is normally distributed. OB. The sampling distribution is approximately normal because the population is normally distributed and the sample size is large enough. C. The sampling distribution is approximately normal because the sample size is large enough. D. The sampling distribution is assumed to be approximately normal. (b) What is the mean and standard deviation of the sampling…
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