statistics chapter 1 test answers

The population standard deviation is σ (sigma) and sample standard deviation is s. Population standard deviation                 Sample standard deviation. The population variance is σ2 (sigma squared) and population standard deviation is σ (sigma). preventing userd from accessing a website by sending a large number of link requests in a short period -> disruption of service What is the purpose of the network security authentication function? This plot graphs the observed data, ranked in ascending order, against the “expected” Z-score of that rank. Our primary method is the normal probability plot. Fill in the blank. The coefficient of variation expresses the standard deviation as a percentage of the sample or population mean. The curve is bell-shaped, symmetric about the mean, and defined by µ and σ (the mean and standard deviation). To find the area for values of X, a normal random variable, draw a picture of the area of interest, convert the x-values to Z-scores using the Z-score and then use the standard normal table to find areas to the left, to the right, or in between. The sample variance is unbiased due to the difference in the denominator. The larger the number the more delay. 31. Today the network administrator checked connectivity by pinging between hosts H1 and H3 that resulted in a round trip time of 1458/2390/6066. Change the permission on the file from ro to rw. Explanation: The startup configuration file is stored in NVRAM, and the running configuration is stored in RAM. Variation refers to the amount that the values vary among themselves. Normality cannot be assumed. A normal and standard normal curve. To find Z-scores that limit the middle 95%: Figure 14. R. and . Several elements that are needed to scale a network include documentation of the physical and logical topology, a list of devices that are used on the network, and an analysis of the traffic on the network. It sets a 6 milliseconds timeout for each replay. Figure 6. Many continuous random variables have a bell-shaped or somewhat symmetric distribution. (Choose three.). If the sample data were taken from a normally distributed random variable, then the plot would be approximately linear. Think of discrete variables as “hens.” Hens can lay 1 egg, or 2 eggs, or 13 eggs… There are a limited, definable number of values that the variable could take on. Fisheries biologists were studying the length and weight of Pacific salmon. This shows us that the sample mean is a random variable! when it is on the main network segment only. 37. A network administrator for a small campus network has issued the show ip interface brief command on a switch. Tracert is used to trace the path a packet takes. For approximately 25.78% of the years, Jones City will get more than 40 in. 35. Figure 11. (Choose two.). Network monitoring is also an important consideration, but not as important as modularity. 11. How should traffic flow be captured in order to best understand traffic patterns in a network? Which type of network attack involves the disabling or corruption of networks, systems, or services? The population mean is μ (mu). Boxplots use the 5-number summary (minimum and maximum values with the three quartiles) to illustrate the center, spread, and distribution of your data. The area under a normal curve for P(x<82). and a standard deviation (standard error) of = 0.822 lb. (Choose two.). A population of fish has weights that are normally distributed with µ = 8 lb. As a biologist you determine that a weight less than 82 lb. S is a . Cracking the password for a known username is a type of access attack. To calculate the median with an odd number of values (n is odd), first sort the data from smallest to largest. What do WLANs that conform to IEEE 802.11 standards allow wireless users to do? consists of a 32-character string and is not case sensitive, responsible for determining the signal strength, used to encrypt data sent across the wireless network, create a one-to-many local network using infrared technology, use cell phones to access remote services over very large areas. Imagine if we take a series of different random samples from the same population and all the same size: Each time we sample, we may get a different result as we are using a different subset of data to compute the sample mean. The null hypothesis for this test is that the sample data have been drawn from a normally distributed population. Explain: of rain. Once we have organized and summarized your sample data, the next step is to identify the underlying distribution of our random variable. Which two statements describe how to assess traffic flow patterns and network traffic types using a protocol analyzer? What is the area associated with the Z-score 1.62? 16. CCNA 3 Exam Answers Cisco CCNA 3 Scaling Networks v6.0 – ScaN Chapter 1 Exam Answers 2019 CCNA 3 (v5.0.3 + v6.0) Chapter 1 Exam Answers 2019 – 100% Full Table 1. While there are a multitude of available graphics, this chapter will focus on a specific few commonly used tools. Which threat is the network administrator trying to prevent? PHSchool.com has been retired. 1 inch = 36 inches 1 inch = 36. Which two traffic types require delay sensitive delivery? of rain each year with a standard deviation of 5.1 in. Accounting keeps track of the actions of the user. The show version command that is issued on a router displays the value of the configuration register, the Cisco IOS version being used, and the amount of flash memory on the device, among other information.​. Degrees of freedom: In general, the degrees of freedom for an estimate is equal to the number of values minus the number of parameters estimated en route to the estimate in question. Check “Labels in First Row” and “Summary Statistics”. Read across the top row to get the second decimal place in the Z-score (0.02). The show cdp neighbor detail command will reveal the IP address of a neighbor only if there is Layer 3 connectivity. Linking to a non-federal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the website. Information theft Continuous variables have an infinite number of possible values. In this section, we will examine descriptive statistics in terms of measures of center and measures of dispersion. Open up Excel and enter the data in the first column of the spreadsheet. In the boxplot, Q1 is farther away from the median as are the minimum values, and the left whisker is longer than the right whisker. Something is causing interference between H1 and R1. Which firewall feature is used to ensure that packets coming into a network are legitimate responses initiated from internal hosts? For example, if we want to estimate the heights of eighty-year-old cherry trees, we can proceed as follows: We want to use this sample mean to estimate the true but unknown population mean. Occam's razor, Ockham's razor, Ocham's razor (Latin: novacula Occami), or law of parsimony (Latin: lex parsimoniae) is the problem-solving principle that "entities should not be multiplied without necessity", or more simply, the simplest explanation is usually the right one. A newly hired network technician is given the task of ordering new hardware for a small business with a large growth forecast. But before we begin exploring different types of statistical methods, a brief review of descriptive statistics is needed. Application filtering can permit or deny access based on port number. 13. Introductory Statistics includes innovative practical … In the boxplot, Q3 is farther away from the median, as is the maximum value, and the right whisker is longer than the left whisker. Free download PDF File When paired with histograms, they give an excellent description, both numerically and graphically, of the data. Small businesses today do need Internet access and use an Internet router to provide this need. Only capture traffic in the areas of the network that receive most of the traffic such as the data center. Links with this icon indicate that you are leaving the CDC website.. Explain: A network technician issues the C:\> tracert -6 www.cisco.com command on a Windows PC. We use sample statistics to estimate population parameters (the truth). 2. There are normal curves for every combination of µ and σ. Figure 19. Good statistics come from good samples, and are used to draw conclusions or answer questions about a population. With qualitative data, each category is represented by a specific bar. 34. Measures of dispersion look at the spread or variation of the data. 17. (The area to the left of the mean equals the area to the right of the mean.). What is a security feature of using NAT on a network? The positive side is for all Z-scores greater than zero (all values greater than the mean). CCNA 1 v5.0.2 + v5.1 + v6.0 Chapter 11 Exam Answers 2019 2020 100% Updated Full Questions latest 2017 - 2018 Introduction to Networks. Explain: Variables are the characteristics we are interested in. It is a unitless measure. Never use passwords that need the Shift key. The Central Limit Theorem (CLT) states that the sampling distribution of the sample means will approach a normal distribution as the sample size increases. is unhealthy and you want to know what proportion of your population is unhealthy. The median will be less affected by these extreme large values, so in this situation, the mean will be larger than the median. Measures of center look at the average or middle values of a data set. A normal curve can be used to estimate probabilities. Also check “Output Range” and select location for output. If the question is not here, find it in Questions Bank. The differences are squared to deal with positive and negative differences. Lastly, enable SSH on the vty lines on the router. While the sample variance is the positive, unbiased estimator for the population variance, the units for the variance are squared. The arithmetic mean of a variable, often called the average, is computed by adding up all the values and dividing by the total number of values. Match the type of information security threat to the scenario. For example, if a normally distributed random variable has a μ = 6 and σ = 2, then a value of x = 7 corresponds to a Z-score of 0.5. Think of continuous variables as “cows.” Cows can give 4.6713245 gallons of milk, or 7.0918754 gallons of milk, or 13.272698 gallons of milk … There are an almost infinite number of values that a continuous variable could take on. Which command will backup the configuration that is stored in NVRAM to a TFTP server?

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