Refer to the accompanying data set and use the 25 home voltage measurements to construct a frequencydistribution with five classes. Begin with a lower class limit of 127.5 volts, and use a class width of 0.2 volt.Does the result appear to have a normal distribution? Why or why not?Click the icon to view the data.Complete the frequency distribution below.Voltage (volts)Frequency127.5 -(Type integers or decimals rounded to the nearest tenth as needed.)Entor u More InfoHomeHomeHomeHome FullDay (volts) Day (volts) Day (volts) Day (volts) data127.88.127.815128.122127.9 set2128.1128.016127.923127.73127.910128.117127.524127.8128.211127.918127.725128.0128.112127.819128.0127.513128.020128.3128.014128.021128.1PrintDone

The data set of 25 measurement of voltage is given. To construct a five class frequency…

Refer to the accompanying data set and use the 25 home voltage measurements to construct a frequency distribution with five classes. Begin with a lower class limit of 127.5 volts, and use a class width of 0.2 volt. Does the result appear to have a normal distribution? Why or why not?

Refer to the accompanying data set and use the 25 home voltage measurements to construct a frequency distribution with five classes. Begin with a lower class limit of 127.5 volts, and use a class width of 0.2 volt. Does the result appear to have a normal distribution? Why or why not?

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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In this problem, assume that the distribution of differences is approximately normal. Note: For degrees of freedom d.f. not in the Student's t table, use the closest d.f. that is smaller. In some situations, this choice of d.f. may increase the P-value by a small amount and therefore produce a slightly more "conservative" answer.At five weather stations on Trail Ridge Road in Rocky Mountain National Park, the peak wind gusts (in miles per hour) for January and April are recorded below. Weather Station 1 2 3 4 5 January 137 124 128 64 78 April 104 115 102 88 61 Does this information indicate that the peak wind gusts are higher in January than in April? Use ? = 0.01. (Let d = January − April.) (a) What is the level of significance? What is the value of the sample test statistic?
Assume that a randomly selected subject is given a bone density test. Those test scores are normally distributed with a mean of 0 and a standard deviation of 1. Draw a graph and find the bone density test scores that can be used as cutoff values separating the lowest 6% and highest 6%, indicating levels that are too low or too high, respectively. Sketch the region containing the lowest 6% and highest 6%. Choose the correct graph below. O A. Za Za E OB. The bone density scores are (Use a comma to separate answers as needed. Round to two decimal places as needed.) Za Za OD. Za Za ♫
Refer to the accompanying data set and use the 25 home voltage measurements to construct a frequency distribution with five classes. Begin with a lower class limit of 127.0 volts, and use a class width of 0.2 volt. Does the result appear to have a normal distribution? Why or why n E Click the icon to view the data. Complete the frequency distribution below. - X More Info Voltage (volts) 127.0 - 127.2 2 - 127.4 Frequency 127.2 127.4 Voltage Measurements From a Home Home 127.6 Home Home Home Full - Day (volts) Day (volts) Day (volts) Day (volts) data 127.8 set 127,9 D 127.2 127.4 127.6 - 127.8 1 127.3 8 127.3 15 127.7 22 127.8 - 128.0 127.0 127.4 2 127.0 16 127.6 23 (Type integers or decimals rounded to the nearest tenth as needed 3 10 127.6 17 127.5 24 127.2 127.1 127.8 127.6 4 127.6 11 127.5 18 25 5 127.8 12 127.8 19 6 127.1 127.5 20 127.3 13 7 127.1 14 21 Print Done
3.4.2 2. Find the following z-scores: a. Za10 b. Zo975 c. Z,005 0.15 e. Z30 "0.80 f. Z 0.30
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In this problem, assume that the distribution of differences is approximately normal. Note: For degrees of freedom d.f. not in the Student's t table, use the closest d.f. that is smaller. In some situations, this choice of d.f. may increase the P-value by a small amount and therefore produce a slightly more "conservative" answer. At five weather stations on Trail Ridge Road in Rocky Mountain National Park, the peak wind gusts (in miles per hour) for January and April are recorded below. Weather Station January April USE SALT Does this information indicate that the peak wind gusts are higher in January than in April? Use α = 0.01. (Let d = January - April.) (a) What is the level of significance? 1 2 3 4 5 137 120 126 64 78 104 115 102 88 61 State the null and alternate hypotheses. Will you use a left-tailed, right-tailed, or two-tailed test? Ho: My = 0₁ H₁: 0; two-tailed O Hoi Hd O1 H₁: M O Hot Hd = 0; H₁: O Hot Hd = 0; H₁² = 0; right-tailed 0; right-tailed (b) What sampling…
The blood pressure in millimeters was measured for a large sample of people. The average pressure is 140 mm, and the SD of the measurements is 20 mm. The histogram looks reasonably like a normal curv Use the normal curve to estimate the following percentages. Choose the answer that is closest to being correct. A 19.1% B 30.9% C 38.2% D 69.1% E 68.27% A The percentage of people with blood pressure between 130 and 150 mm. B The percentage of people with blood pressure between 140 and 150 mm. D The percentage of people with blood pressure over 150 mm.
For questions 6 through 11, refer to the following table, representing responses from the 2018 GSS: Respondent Sex Mean Hours Worked Last Week Standard Deviation N Male 44.60 14.969 670 Female 38.15 13.276 711 6. What proportion of females worked less than 40 hours per week? a. How many people in the sample does that correspond to?7. What percentage of males worked between 40 and 50 hours per week? a. How many people in the sample does that correspond to?8. What number of hours worked among females corresponds with a Z score of -2.00?9. Calculate the number of hours worked last week that corresponds to the 95th percentile for each sex. a. If you were going to calculate the 75th percentile, what Z value would you use? 10. Calculate the standard error for both males and females. a. What are you using for sigma, and why? 11. Calculate the 95% confidence interval for each sex. Can you say with 95% confidence that they are different? Why or why not? a. If you were…
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