Intro to Routing with Lab

Intro to Biostatistics

Quiz_1_STAT_219.docx-Total score: 10 out of 10,

 Question 1 0 out of 2 points The following is a cross tabulation on smoking status of 5375 students and their parents: Which of the following is correct? Selected Answer: The proportion of families where neither parent smokes is lower for students who do not smoke than for students who do smoke. Correct Answer: The proportion of students who smoke when one parent smokes is more than the percentage of students who smoke when both parents smoke. Response Feedback: This is incorrect. The percentage of students who smoke is computed as (188 + 416 + 400)/5375 = 19%. Text reference: Section 5.1 Marginal Distributions  Question 2 2 out of 2 points In some reptiles, the sex ratio of hatched eggs depends on the ambient temperature. Consider the data from a small study comparing the eﬀect of temperature on the sex ratio for two species: The proportion of hatched eggs that are female over both species under cold ambient conditions is: Selected Answer: 71 %. Correct Answer: 71 %. Response Feedback: This is correct. Text reference: Section 5.2 Conditional Distributions  Question 3 2 out of 2 points In some reptiles, the sex ratio of hatched eggs depends on the ambient temperature. Consider the data from a small study comparing the eﬀect of temperature on the sex ratio for two species: Which of the following is correct? Selected Answer: For both species, the probability of a male hatchling is greater under warm ambient conditions. Correct Answer: For both species, the probability of a male hatchling is greater under warm ambient conditions. Response Feedback: This is correct. Text reference: Section 5.2 Conditional Distributions  Question 4 2 out of 2 points Will giving cocaine addicts an antidepressant drug help them break their addiction? An experiment assigned 24 chronic cocaine users to take the antidepressant drug desipramine, another 24 to take lithium, and another 24 to take a placebo. (Lithium is a standard drug to treat cocaine addiction. A placebo is a dummy pill, used so that the eﬀect of being in the study but not taking any drug can be seen.) After three years, these were the results. broke addicti on relapse d desiprami ne 14 10 lithium 8 16 placebo 2 22 Which of the following is correct? Selected Answer: 46% of those who relapsed were in the control group. Correct Answer: 46% of those who relapsed were in the control group. Response Feedback: This is correct. Text reference: Chapter 5 Summary  Question 5 2 out of 2 points Will giving cocaine addicts an antidepressant drug help them break their addiction? An experiment assigned 24 chronic cocaine users to take the antidepressant drug desipramine, another 24 to take lithium, and another 24 to take a placebo. (Lithium is a standard drug to treat cocaine addiction. A placebo is a dummy pill, used so that the eﬀect of being in the study but not taking any drug can be seen.) After three years, these were the results. broke addicti on relapse d desiprami ne 14 10 lithium 8 16 placebo 2 22 Which of the following is correct?

STAT | 219 | Intro to Biostatistics | assessment |  Question 1 0 out of 2 points

Total score: 10 out of 10, 100% A market research company wishes to ﬁnd out whether the population of students at a university prefers Brand A or Brand B of instant coﬀee. A random sample of 100 students is selected, and each one is asked to try Brand A and then Brand B (in random order). They then indicate which brand they prefer, and 65 students preferred Brand B. Which is the parameter of interest? (a) the proportion of sampled students who preferred Brand B (b) the proportion of all students who prefer Brand B (c) the proportion of all students who were sampled (d) the proportion of students who tasted Brand A ﬁrst 1 out of 1 This is correct. Text reference: Section 13.1 Parameters and Statistics The sampling distribution of a statistic is (a) the probability that we observed the statistic in repeated samples. (b) the mechanism that determines if the randomization was eﬀective. (c) the distribution of values of the statistic over repeated samples from the population. (d) the extent from which the sample results diﬀer systematically from the truth. 1 out of 1 This is correct. Text reference: Section 13.3 Sampling Distributions The lengths of individual ﬁsh in a pond have an approximate Normal distribution with a mean of 18.6 cm and a standard deviation of 6.0 cm. A sample of 36 ﬁsh is taken. What is the mean of the sampling distribution of the sample mean for the 36 ﬁsh? (a) 1.0 cm (b) 3.1 cm (c) 6.0 cm (d) 18.6 cm 1 out of 1 This is correct. Text reference: Section 13.4 The Sampling Distribution of The lengths of individual ﬁsh in a pond have an approximate Normal distribution with a mean of 18.6 cm and a standard deviation of 6.0 cm. A sample of 36 ﬁsh is taken. What is the standard deviation of the sampling distribution of the sample mean for the 36 ﬁsh? (a) 1.0 cm (b) 3.1 cm (c) 6.0 cm (d) 18.6 cm 1 out of 1 This is correct. Text reference: Section 13.4 The Sampling Distribution of The lengths of individual male ﬁsh in a pond have a very skewed distribution with a mean of 18.6 cm and a standard deviation of 6.0 cm. There are many small ﬁsh and a few very large ﬁsh. A sample of 10 ﬁsh is taken using a trap that is equally eﬀective for all lengths of ﬁsh. Which of the following is correct? (a) The mean of the sampling distribution will remain unbiased despite the skewness. (b) The sampling distribution of the sample mean will be exactly Normally distributed. (c) The standard deviation of the sample mean will be larger than the standard deviation of the individual lengths. (d) The distribution of the individual lengths is approximately Normally distributed. 1 out of 1 This is correct. Text reference: Section 13.5 The Central Limit Theorem Approximately 20% of 1000 ﬁsh in a pond are infected with a skin disease. A random sample of 20 ﬁsh is selected. The mean of the sampling distribution for the proportion of your sample that is infected is: (a) 0.20. (b) 0.008. (c) 0.089. (d) 4.0.

STAT | 219 | Intro to Biostatistics | assessment | Total score: 10 out of 10  100

 Question 1 2 out of 2 points Consider measuring the height (cm), sex (0=males, 1=females), number of seeds produced, and maturity of the seeds (on a 1-4 scale). Which of the following is correct? Selected Answer: Maturity rating is an ordinal variable. Correct Answer: Maturity rating is an ordinal variable. Response Feedback: This is correct. Text refer

quiz_1b.docx-Question 1 2 out of 2

Question 1 2 / 2 pts (TCO 4) This dynamic routing protocol was designed to be used to connect different autonomous systems or organizations. Correct!   BGP   RIPv2   OSPF   EIGRP   None of the above   Type: MC See 7.1.4 Types of Routing Protocols.   Question 2 2 / 2 pts (TCO 4) Which requirement is necessary to have an ultimate route in a routing table?   Classful subnets Correct!   Next-hop address   Administrative distance   Floating route   All of the above   Pool 3 – 3:1; 2 points; address TCO 4 Type: MC See 7.5.4 Analyze an IPv6 Routing Table. Question 2 2 / 2 pts (TCO 4) Which requirement is necessary to have an ultimate route in a routing table?   Existence of classful subnets   Default route   Ingress interface   Floating route Correct!   None of the above   Type: MC See 7.5.4 Analyze an IPv6 Routing Table.   Question 3 0 / 2 pts (TCO 4) Which event will trigger the sending of link-state packets to neighbor routers? The flush timer expires. A link to the core router has become congested.   The synchronization timer expires.   Answers A, B, and C are correct. Correct!   None of the above   Type: MC See 7.4.2 Link-State Updates.   Question 4 2 / 2 pts (TCO 4) A disadvantage to using static routes is _____.   the path a static route uses to send data is known   use less resource on the router   static routes use less bandwidth than dynamic routing protocols Correct!   initial configuration and maintenance is time-consuming   None of the above   Pool 5 – 3:1; 2 points; address TCO 4 Type: MC See Chapter 6, page 287. (TCO 4) An advantage of using static routing is _____. Correct!   static routes are not advertised over the network, resulting in better security   they are refreshed regularly so the information is current   they can reroute around downed links   static routing makes it easier to manage the network since routing decision is predictable   None of the above   Type: MC See Chapter 6, page 286.   Question 5 2 / 2 pts (TCO 4) What task does a dynamic routing protocol perform?   Discover hosts Correct!   Update and maintain routing table   Share default gateway information   Network availability   Assign IP addressing   Type: MC See 7.1.1 Dynamic Routing Protocol Operation. (TCO 4) Which statement is true regarding classless routing protocols? Correct!   Sends subnet mask information in routing updates   Sends complete routing table update to all neighbors   Is supported by RIP version 1 only   Reduces the amount of address space available in an organization   None of the above   Type: MC See 7.1.4 Types of Routing Protocols.

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