2. It is well known that infants born to mothers who smoke tend to be small and prone to a range ofailments. It is conjectured that also they look abnormal. Nurses were shown selections of photographsof babies, one half of whom had smokers as mothers; the nurses were asked to judge from a baby'sappearance whether or not the mother smoked. In 1500 trials the correct answer was given 910 times.Is the conjecture plausible? If so, why?

Answered: Image /qna-images/answer/7a09086e-4855-4225-9f65-9afe63df1afd.jpg

Answered: 2. It is well known that infants born…

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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Use the results from a survey of a simple random sample of 1045 adults. Among the 1045 respondents, 92% rated themselves as above average drivers. We want to test the claim that 4/5 of adults rate themselves as above average drivers. Complete parts (a) through (c). a. Identify the actual number of respondents who rated themselves as above average drivers.
Sleep apnea is a condition in which the sufferers stop breathing momentarily while they are asleep. This condition results in lack of sleep and extreme fatigue during waking hours. A current estimate is that 10.9 million out of the 312.7 million Americans suffer from sleep apnea, or approximately 3.5 % . A safety commission is concerned about the percentage of commercial truck drivers who suffer from sleep apnea. They do not have any reason to believe that it would be higher or lower than the population's percentage. To test the claim that the percentage of commercial truck drivers who suffer from sleep apnea is not 3.5 % , a simple random sample of 308 commercial truck drivers is examined by a medical expert, who concludes that 19 suffer from sleep apnea. Does this evidence support the claim that the percentage of commercial truck drivers who suffer from sleep apnea is not 3.5 % ? Use a 0.05 level of significance. Step 1 of 3: State the null and alternative hypotheses for the test.…
A research group conducted an extensive survey of 2929 wage and salaried workers on issues ranging from relationships with their bosses to household chores. The data were gathered through hour-long telephone interviews with a nationally representative sample. In response to the question, "What does success mean to you?" 1571 responded, "Personal satisfaction from doing a good job." Let p be the population proportion of all wage and salaried workers who would respond the same way to the stated question. Find a 90% confidence interval for p. (Round your answers to three decimal places.) lower limit upper limit
QUESTION 2 In decision analysis, the detection rate is the same thing as a. the accuracy rate. b. the false positive rate. O. the specificity. O d. the sensitivity.
Researchers from the Department of Education are always looking for ways to improve methods of instruction to undergraduate students. The aim is to know whether gender (male/female/non-binary) is associated with preferred learning medium (online/in person/hybrid). The data is represented as below. Find the appropriate chi-square statistic to the nearest hundredth. Online In Person Hybrid Male 36 17 4 Female 23 49 8 Non Binary 6 14 16
A researcher believes that 52.5% of people who grew up as the only child have an IQ score over 100. However, unknown to the researcher, this figure is actually 50%, which is the same as in the general population.To attempt to find evidence for the claim, the researcher is going to take a random sample of 400 people who grew up as the only child. Let p be the proportion of people in the sample with an IQ score above 100. Answer the following: a) Find the mean of p: b)Find the standard deviation of p: c) Compute an approximation for P(p ≥ 0.525), which is the probability that there will be 52.5% or more people with IQ scores over 100 in the sample. Round your answer to four decimal places.
information is also recorded on males/females in the community. Please use the information to answer the question below. Population Deaths 238 Deaths due to Jingle Jangle 143 Deaths due to Fizzle Rocks 45 Deaths due to Other Causes Males 251,480 40.0 per 100,000 56.86 per 100,000 22.94 per 100,000 79.8 per 100,000 50 Females 248,520 221 57 21 143 What is the cause-specific mortality rate pertaining to deaths from Jingle Jangle among the population living in Riverdale this year?
Question Two.
A researcher believes that 51% of people who grew up as the only child have an IQ score over 100. However, unknown to the researcher, this figure is actually 50%, which is the same as in the general population. To attempt to find evidence for the claim, the researcher is going to take a random sample of 400 people who grew up as the only child. Let p be the proportion of people in the sample with an IQ score above 100. Answer the following. (If necessary, consult a list of formulas.) (c)Compute an approximation for , which is the probability that there will be 51% or more people with IQ scores over 100 in the sample. Round your answer to four decimal places.
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When we test the hypothesis that the population proportions are equal, we can use the Z test for a one-sided as well as a two-sided alternative. Select one: a. False b. True C. Not sure
A paper investigated the driving behavior of teenagers by observing their vehicles as they left a high school parking lot and then again at a site approximately 1 2 mile from the school. Assume that it is reasonable to regard the teen drivers in this study as representative of the population of teen drivers. Amount by Which Speed Limit Was Exceeded MaleDriver FemaleDriver 1.3 -0.1 1.3 0.4 0.9 1.1 2.1 0.7 0.7 1.1 1.3 1.2 3 0.1 1.3 0.9 0.6 0.5 2.1 0.5 (a) Use a .01 level of significance for any hypothesis tests. Data consistent with summary quantities appearing in the paper are given in the table. The measurements represent the difference between the observed vehicle speed and the posted speed limit (in miles per hour) for a sample of male teenage drivers and a sample of female teenage drivers. (Use μmales − μfemales.Round your test statistic to two decimal places. Round your degrees of freedom down to the nearest whole number. Round your p-value to…

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