"An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed, with mean equal to843 hours and a standard deviation of 35 hours. Random samples of 31 bulbs are drawn from this population, and the mean ofeach sample is determined. What is the mean of the mean of the sampling distribution?"B) 35C) 84331

Given data,Mean μ=843sd σ=35n=31Find mean of sampling distribution?

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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five samples of 15 minerals are taken from a population. The sample means for hardness of the minerals are 6.5, seven, seven, 6.5, and six. The standard deviation for the mineral is .745. Find the meaning of the sample means and the standard deviation of the sample means for the hardness
Solve for C
Consider the data set.2, 4, 6, 7, 9(a) Find the range. (b) Use the defining formula to compute the sample standard deviation s. (Round your answer to two decimal places.) (c) Use the defining formula to compute the population standard deviation ?. (Round your answer to two decimal places.)
1 2 3 4 Here are the foot lengths (in centimeters) for a random sample of 7 fourteen-year-olds from the United Kingdom. Find the mean and standard deviation. 25, 22, 20, 25, 24, 24, 28 Mean= type your answer... Standard deviation = type your answer... cm cm
3565 6781 11366 5656 10024 9101 9286 10376 7290 15558 6657 20795 4027 19100 16223 14502 2830 5785 9070 7560 D) Calculate the mean and standard deviation of your data set. You may use technology such as Google Sheets, Excel, or a TI-83/TI-84. Round to the nearest hundredth. Mean 9777.6 Standard Deviation 5090.73 E) Using a significance level a = 0.05, find the critical value using the following steps. 1. What are the degrees of freedom? n D20 d. f.= n- 1=19 = 19 2. Will this be a one-tailed or two tailed test? two-tailed 3. Using table 5 from the back of your textbook (page A18 in Appendix B), what is the critical value? 1.729
4000 B.C. A.D. 150 A study was done on skull sizes of humans during different time periods. The results are shown in the table. 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) and (b) below. H2 27 27 131.05 mm 133.94 mm S 5.18 mm 5.27 mm a. Use a 0.05 significance level to test the claim that the mean skull breadth in 4000 B.C is less than the mean skull breadth in A.D 150. What are the null and alternative hypotheses? O B. Ho: H1 =H2 O A. Ho: H1 =H2 H:H1> H2 OC. Ho: H1 = H2 H1: H1 # H2 O D. Ho: H1 # H2 H: H1
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"An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed, with mean equal to 858 hours and a standard deviation of 54 hours. Random samples of 50 bulbs are drawn from this population, and the mean of each sample is determined. What is the mean of the mean of the sampling distribution?" 858 B 8 54 D) 50
Suppose that 49% of all adult women think they do not get enough time for themselves. An opinion poll interviews 958 randomly chosen women and records the sample proportion who feel they don't get enough time for themselves. a. Describe the sampling distribution of p. Mean = ________ Standard Deviation=__________ b. The truth about the population is p=0.49. In what range will the middle 95% of all sample results fall? lower bound -_______________ upper bound -_______________ c. What is the probability that the oll gets a sample in which fewer than 47% say they do not get enough time for themselves.
16
Consider the following sample data. Sample A: 11, 22, 33 Sample B: 81, 92, 103 Sample C: 1,100; 1,111; 1,122 (a) Find the mean and standard deviation for each sample. Sample A: Sample B: Sample C: Mean Sample Standard Deviation (b) What does this exercise show about the standard deviation? multiple choice The idea is to illustrate that the standard deviation is not a function of the value of the mean. The idea is to illustrate that the standard deviation is a function of the value of the mean.
Consider the data set. 2, 4, 5, 6, 9 (b) Use the defining formula to compute the sample standard deviation s. (Round your answer to two decimal places.)

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