4. A sample of heights in feet of active volcanoes in North America, outside ofAlaska, is listed below. Is there sufficient evidence that the standarddeviation in heights of volcanoes outside of Alaska is less than the standarddeviation in heights of Alaskan volcanoes which is 2385.9 feet? a = 0.0510,777815911,24010,45614,1638,363

From the provided information, Sample size (n) = 6 Level of significance (α) = 0.05

Answered: 4. A sample of heights in feet of…

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 construction zone on Interstate 15 has a speed limit of 40 mph. The speeds of vehicles passing through this construction zone are normally distributed with a mean of 44 mph and a standard deviation of 3 mph. a. Find the percentage of vehicles who pass through this construction zone who are exceeding the posted speed limit. b. What percentage of vehicles travel through this construction zone with speeds between 50 mph and 55 mph?
A group of adult males has foot lengths with a mean of 28.07 cm and a standard deviation of 1.42 cm. Use the range rule of thumb for identifying significant values to identify the limits separating values that are significantly low or significantly high. Is the adult male foot length of 25.0 cm significantly low or significantly high? Explain. Significantly low values are cm or lower. (Type an integer or a decimal. Do not round.)
2. Maple tree diameters in a forest area are normally distributed with mean 10 inches and standard deviation 2.2 inches. Find the proportion of trees having a diameter greater than 15 inches. Answer:
According to survey data, the distribution of arm spans for females is approximately Normal with a mean of 65.3 inches and a standard deviation of 3.4 inches. a. What percentage of women have arm spans less than 61 inches? b. A particular female swimmer has an estimated arm span of 73 inches. What percentage of females have an arm span at least as long as this person? a. The percentage of women with arms spans less than 61 inches is% (Round to one decimal place as needed.) b. The z-score for an arm span of 73 inches is (Round to two decimal places as needed.) The percentage of females who have an arm span at least as long is this person is 0% (Round to one decimal place as needed.) CITS
The systolic blood pressure of adults in the USA is nearly normally distributed with a mean of 119 and standard deviation of 21 .Someone qualifies as having Stage 2 high blood pressure if their systolic blood pressure is 160 or higher.a. Around what percentage of adults in the USA have stage 2 high blood pressure?b. If you sampled 4500 people, how many would you expect to have BP> 160? Give your answer to the nearest person. peoplec. Stage 1 high BP is specified as systolic BP between 140 and 160. What percentage of adults in the US qualify for stage 1?
3. Use the following information about the heights measured in feet of a sample of 40 Ponderosa Pine trees and 40 Eastern White Pine trees. Ponderosa Pine Trees: Mean of 77.5 ft with a standard deviation of 11.55 ft Eastern White Pine Trees: Mean of 67.25 ft with a standard deviation of 10.33 ft Is it more unusual for a Ponderosa Pine tree to have a height of 71 ft or an Eastern White Pine tree to have a height of 71 ft relative to the data of each species of tree? Use z-scores to explain your solution.
2. The average price of a sample of 12 bottles of diet salad dressing taken from different stores is $1.43. The standard deviation is $0.09. The average price of a sample of 16 low-calorie frozen desserts is $1.03. The standard deviation is $0.10. At a = 0.05, is the price of salad dressings significantly higher than the price of frozen desserts?
1) The average amount of rainfall in Puerto Rico during the past month was 3.5 inches, according to the National Meteorology Center. Suppose that a normal distribution can be used and that the standard deviation is 0.8 inches. to. What percentage of the time last month's rainfall was greater than 4 inches? b. What percentage of the time was the rainfall less than 3 inches? c. A month is considered extremely wet if the rainfall is 10% higher for that month. How much rainfall must be in April for it to be considered an extremely wet month?
Please see attached.
3. The distribution of passenger vehicle speeds traveling on the Interstate 5 Freeway (I-5) in California is nearly normal with a mean of 72.6 miles/hour and a standard deviation of 4.78 miles/hour. a. What percent of passenger vehicles travel slower than 80 miles/hour? What percent of passenger vehicles travel between 60 and 80 miles/hour? B. How fast do the fastest 5% of passenger vehicles travel? C. The speed limit on this stretch of the I-5 is 70 miles/hour. Approximate what percentage of the passenger vehicles travel above the speed limit on this stretch of the I-5.
1. The EPA fuel economy estimates for automobile models tested recently predicted a mean of 24.8 mpg and a standard deviation of 6.2 mpg for highway driving. a. About what percent of cars get less than 31 mpg? b. What percent of cars get more than 20 mpg? c. What percent of cars get between 22 and 30 mpg? d. What gas mileage represents the 75th percentile? e. What gas mileages separate the bottom 3% and top 3% of cars? X
36. Packages of Lay's Potato Chips have a population standard deviation of 0.16 ounces. An SRS of 100 bags of Lay's Potato Chips have a sample mean of 18.024 ounces. What is the Standard Error for the average weight of the bags of Lay's Potato Chips ?

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