Physicians measured blood lead levels in a random sample of 101 painting contractors in several states. Themeasured lead levels had a sample mean of 27.2 μg/dL (micrograms per deciliter) and a sample standarddeviation of 16.1 μg/dL. Calculate the 95% confidence interval for the true mean. Use the appropriate z-table or t-table B.(24.3, 29.5)(25.0, 28.0)(25.2, 29.2)(25.6, 28.9)

Step 1: We will use the formula for the confidence interval and the appropriate critical value from…

Answered: Physicians measured blood lead levels…

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 random sample of 93 observations produced a mean x = 25.5 and a standard deviation s 2.8. a. Find a 95% confidence interval for u. b. Find a 90% confidence interval for u. c. Find a 99% confidence interval for u.
Suppose a set of data has mean μ=29 and standard deviation σ=1.3. (Give answers accurate to three decimal places.) What is the z-score for the data value x=26? z= What is the z-score for the data value x=31? z= What data value corresponds to the z=score: z=2.3? x= What data value corresponds to the z=score: z=−1.1? x=
A sample of size n = 36 is drawn from a population whose standard deviation is σ = 15.6. The sample mean is x = 94.5. Construct a 95% confidence interval.
A random sample of 88 observations produced a mean x=25.8 and a standard deviation s=2.5. a. Find a 95% confidence interval for μ. b. Find a 90% confidence interval for μ. c. Find a 99% confidence interval for μ. a. The 95% confidence interval is (enter your response here,enter your response here).
A sample of 14 small bags of the same brand of candies was selected. Assume that the population distribution of bag weights is normal. The weight of each bag was then recorded. The mean weight was 2 ounces with a standard deviation of 0.12 ounces. The population standard deviation is known to be 0.1 ounce. x = σ = sx = n = n − 1 =
A sample with a mean of M=62 and a standard deviation of s= 5 is transformed into a standardized distribution with μ=50 and σ=10. Find the new, standardized score for each of the following values from the original population. X=61 X= 55 X= 65 X= 74
TF.15 The standard deviation of a random sample of the hourly wages of 18 post office employees is s = $3.38. Assuming normal distribution, find a 95% confidence interval for the standard deviation σ. Use X2 - distribution.
Assume that a sample is used to estimate a population mean μμ. Find the 99.5% confidence interval for a sample of size 323 with a mean of 77.2 and a standard deviation of 8.3. Enter your answer accurate to one decimal place (because the sample statistics are reported accurate to one decimal place).
3.2/2
There are many situations in which we want to compare means from populations having standard deviations that are equal. This method applies even if the standard deviations are known to be only approximately equal. Consider a report regarding average incidence of fox rabies in two regions. For region I, n1 = 16, x1 ≈ 4.73, and s1 = 2.84 and for region II, n2 = 15, x2 ≈ 3.93, and s2 = 2.45. The two sample standard deviations are sufficiently close that we can assume ?1 = ?2. Use the method of pooled standard deviation to consider the report, testing if there is a difference in population mean average incidence of rabies at the 5% level of significance. (Round your answer to three decimal places.) t =
6.2.3 Find the critical value t, for the confidence levelc=0.99 and sample size n= 12. Click the icon to view the t-distribution table. (Round to the nearest thousandth as needed.)
tion. Use this information to construct the 90% and 95% confidence intervals fc of the confidence intervals. ce of a certain stock was $123.13. Assume the population standard deviation is

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