Answered: 13. Employees at a construction and… | bartleby

A First Course in Probability (10th Edition)

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Question

13.find Ho and Ha
Ho:
i M290,000,00
HeiM
2 90,000.00
X=85,000
M=90,000.00
V =l6, 500
Zニ文ー
2=X-M-
85000-90,00O
_ -5000
1,45प. 13
IT
1500
J20
コ=20
a=0.05
Z3D3.43
n-1=20-1= 19
343
- 7-861
hejeet Ho
TC=-2-861
H and H
26
Hi

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13. Employees at a construction and mining company claim that the mean salary of the
company for mechanical engineers is less than that one of its competitors at $ 90,000. A
random sample of 25 for the company's mechanical engineers has a mean salary of
$85,000. Assume the population standard deviation is $ 6500 and the population is
normally distributed.
Find HO and H1. Solve

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In Country A, the population mean height for 3-year-old boys is 37 inches. Suppose a random sample of 15 3-year-old boys from Country B showed a sample mean of 36.8 inches with a standard deviation of 2 inches. The boys were independently sampled. Assume that heights are Normally distributed in the population. Complete parts a through c below. -..-- a. Determine whether the population mean for Country B boys is significantly different from the Country A mean. Use a significance level of 0.05. Which of the following correctly states Ho and Hą? Ho:µ+37 O A. Ha: H= 37 Ho: µ> 37 O B. Ha: us 37 Ho: μ237 OC. Haiu 37 Ho: H = 37 Hạ: H#37 Find the test statistic. t= - 0.39 (Type an integer or decimal rounded to two decimal places as needed.) Find the p-value. p= 0.702 (Type an integer or decimal rounded to three decimal places as needed.) Reject or do not reject Ho. Choose the correct answer below. A. Do not reject Ho. There is no reason to believe that 37 in. is not the population mean at a…
27. The average number of cavities that 30-year-old Americans have had in their lifetimes is 7.0. The standard deviation 2.7 cavities. Is the mean different for 20-year-olds? The data show the results of a survey of 15 twenty-year-olds who were asked how many cavities they have had. Assume that that distribution of the population is normal. 6, 7, 5, 3, 7, 8, 4, 6, 5, 6, 4, 6, 7, 6, 9 What can be concluded at the 0.05 level of significance? H0: = 7 Ha: [ Select ] ["<", ">", "Not Equal To"] 7 Test statistic: [ Select ] ["Z", "T"] p-Value = [ Select ] ["0.13", "0.26", "0.03", "0.06"] [ Select ] ["Fail to Reject Ho", "Reject Ho"] Conclusion: There is [ Select ] ["statistically…
1. "The weights of 1,000 children, in average, is 45kg with standard deviation of 18kg. Suppose the weights are normally distributed, how many children weigh between 53kg and 58kg?"a. 670b. 236c. 94d. 764
A data set lists weights (Ib) of plastic discarded by households. The highest weight is 5.47 Ib, the mean of all of the weights is x = 1.819 Ib, and the standard deviation of the weights is s =1.401 lb. a. What is the difference between the weight of 5.47 Ib and the mean of the weights? b. How many standard deviations is that [the difference found in part (a)]? c. Convert the weight of 5.47 Ib to a z score d. If we consider weights that convert to z scores between -2 and 2 to be neither significantly low nor significantly high, is the weight of 5.47 Ib significant? a. The difference is Ib. (Type an integer or a decimal. Do not round.)
Assume that women have diastolic blood pressure measures that arenormally distributed with a mean of 69.9 mm Hg and a standard deviation of 8.8 mm Hg. a. A diastolic blood pressure level above 90 mm Hg is considered to be hypertension. What percentage of women have hypertension? b. If we randomly collect samples of women with 25 in each sample, what percentage of those samples have a mean above 90 mm Hg?
Find the mean and standard deviation of the number of red-headed Scots in a randomly selected group of 155. The probability of having red hair is still 13% for Scottish people. a. Mean = b. Standard deviation (Round to 2 places)=
6. A distribution with a µ = 55 and o = 6 is standardized so that the new mean and standard deviation will be u = 50 and o = 10. When the new distribution is standardized, what value will be obtained for a score of x = 52 from the original distribution? a. X= 45 b. X = 47 C. X= 52 d. X = 53
7.
. In a county male height is normally distributed with a mean of 177 cm and astandard deviation of 6 cm. What percentage of males have a height between 170cm and 182 cm.
3. The average height of a male student in the EDA class of Engr. Ventura in PLM has historically been 1.625 meters with a standard deviation of 0.07 meter. Is there a reason to believe that there has been a change in the average height of male EDA students under Engr. Ventura if a random sample of 50 males in the present EDA class has an average height of 1.652 meters? Assume the standard deviation remains the same.
5. The mean birth weight for babies born one month early is 2630 grams. Assume that the population has a standard deviation of 220 grams. Sketch the distribution of birth weights (in grams) of children born one month early. Calculate probability of a child born one month early with a birth weight between 2100 grams and 2900 grams. Find the weight which corresponds to the top 25% of birth weights for babies born one month early.
5.

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