A sample of 100 individuals was selected at random from a certain population and 18 said that they are left-handed. Test the hypothesis that less than 20% of the population are left-handed using a = 0.05
Q: An article in a journal reports that 31% of American fathers take no responsibility for child care.…
A: Given, Population proportion P=31%=0.31 Sample size of fathers n=235 Number o fathers who did not…
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A: Given, The sample proportion is, The null and alternative hypothesis is:
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A: Solution : Given data: Skipped breakfast : n1 = 200 , x1 = 82Ate breakfast : n2 =300 , x2 =…
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A: Solution: Given information: n= 200 Sample size of drivers x = 122 drivers drive an American made…
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A: Given that Then we have to find z score and p value:
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A: Given Information: Let 1 be the subscript of males and 2 be the subscript of females n1 = 250 n2 =…
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Q: Previously , 11.5 % of workers had a travel time to work of more than 60 minutes . An urban…
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A: Given:We need to construct the confidence interval for the difference between the means
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Q: A recent college graduate is trying to decide whether or not pursuing a Master's degree is worth it.…
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Q: A study of parental empathy for sensitivity cues and baby temper mean more empathy) was performed.…
A: Given :Random sample of 30 mothers : x1 = 68n1 = 30Random sample of 36 fathers :x2 = 57n2 = 36We…
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A: The one proportion Z-test compares the observed proportion to a theoretical one. The standard normal…
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A: We have given two samples- For sample 1- Sample size, n1 = 16 Sample mean, x1-bar = 74.9% Standard…
Q: A study of parental empathy for sensitivity cues and baby temperament (higher scores mean more…
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Q: A sample of n=24 is selected from a population = 120 and σ = 40. If the sample mean is 130, what is…
A: It is given that the population mean, μ=120 and standard deviation, σ=40. For the sample size of 24,…
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A: H0 : p = 0.13 H1: p ≠ 0.13
Q: a simple random sample of size n = 49 is obtained from a population ha is skewed right wih = 83 and…
A: (a) sampling distribution: A simple random sample size of n is given which is obtained from the…
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Q: A researcher has participants expecting to receive either painful or mild electrical shocks during a…
A: Usually in survival analysis studies we can use both parametric and non-parametric statistics. For…
Q: What is the P-value?
A: Given: Sample size =160 x = 5 smoked 21 or more cigarettes during pregnancy α=0.1 level of…
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A: Let p be the true proportion of college graduates who have student loan debt. Sample size (n) = 200…
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A: Given: The manufacturer of a new hybrid sports utility vehicle (SUV) states that, on average. it…
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A: There are two independent samples which are sample 1 and sample 2. We have to construct the 95%…
Q: What is the p-value?
A: Here sample size is too large so use z test for proportion
Q: The average waiting time of 64 r/s Bank A’s customers at its branches is 4.87 minutes with s.d.…
A: given data x¯1 = 4.87 s1 = 1.1 n1 = 64x¯2 =4.5 s2 = 1.21 n2 =10095% ci for μ1 -…
Q: It has been found that 27.6% of men (Group 1) 20 years and older suffer from hypertension (high…
A: Solution:- from given information sample size n1=169 n2=169 x1=39 x2=54 α=0.05 claim: A higher…
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A: Given that Sample size n = 151 Number of mobile phone users who prefer the producer's brand, X = 28…
Q: A magizine claimed that more than 55% of adults skip breakfast at least 3 days a week. To test this,…
A: Sample size n =80 Favorable cases x =45 Sample proportion p^=x/n =45/80 =0.5625
Q: The president of a local college reported that more than 25% of the students received a…
A: Solution: State the hypotheses Null hypothesis: That is, proportion of the students have…
Q: Need help, please.
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Q: In a study, researchers wanted to measure the effect of alcohol on the hippocampal region, the…
A: Solution: Let X be the hippocampal volume. From the given information, x-bar = 8.09, s = 0.7 and n =…
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A: Given : p = 0.37 n = 114
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Q: Harvard University claims 64% of its Harvard Business School students earn internships on wall…
A: Given that p = 64% = 0.64 n = 6745 , X = 4435
Q: In 1945, an organization asked 1540 randomly sampled Americancitizens, "Do you think we can…
A: Given, The sample proportion is,
Q: eviously, 8.3% of workers had a travel time to work of more than 60 minutes. An urban economist…
A: claim : p >0.083n = 50x = 10α = 0.05
Q: 31. 86% of women shave their legs. A cosmetologist thinks this is lower in Europe. A sample of 335…
A:
Q: A study of parental empathy for sensitivity cues and baby temperament (higher scores mean more…
A: Given :Random sample of 31 mothers :x̅1 = 68.4n1 = 31Random sample of 35 fathers :x̅2= 59.1n2 = 35We…
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- the brand name of a certain chain of coffee shops has a 6% recognition rate in the town of Coffleton. An executive from the company wants to verify the recognition rate as the company is interested in opening a coffee shop in the town. he selects a random sample of 6 Coffleton residents, find the probabilty that the number that recognize the brand name is not 431% of all pygmy softshell tortoises have stripes on their shells. A herpetologist in Cititon collects a sample of 28 pygmy softshell tortoises and finds that 8 of them have stripes on their shells. Is there enough evidence to conclude, at a significance of alpha = 0.05, that the proportion of pygmy softshell tortoises in Cititon with stripes on their shells is less than 31%? What is the claim? What is the null hypothesis? What is the alternative hypothesis? What is the test statistic? What is/are the critical value(s)? Do we reject the null hypothesis? What conclusion do we draw? What is the P-value for the problem above?In a sample of 202 men, 77 said they used seat belts. In a sample of 311 women, 84 said they used seat belts. Test the claim that men are more safety conscious than women, at a=0.01?
- A study of parental empathy for sensitivity cues and baby temperament (higher scores mean more empathy) was performed. Let x1 be a random variable that represents the score of a mother on an empathy test (as regards her baby). Let x2 be the empathy score of a father. A random sample of 30 mothers gave a sample mean of x, = 67.85. Another random sample of 25 fathers gave x2 = 61.72. Assume that o, = 10.85 and oz = 10.57. (a) Let µ̟ be the population mean of x, and let uz be the population mean of x2. Find a 90% confidence interval for H1 - H2. (Use 2 decimal places.) lower limit upper limitIn a random sample of 15 freshmen in a calculus class, 2 stated that they planned to be math majors. Use this random sample to test the claim that less than 35% of freshman calculus students plan to major in math at the 5% level of significance.Random samples of 324 are taken from a large population and studied. It was found that x = 7.41. If 22.96% of all sample means were greater than 288.6834. What is μ? μ =
- In a random sample of 1022 Canadian adults, 480 think that the Canadian government is doing too little to protect the environment. In another random sample of 1008 Canadian adults taken 10 years ago, 514 think that the Canadian government is doing too little to protect the environment. At a=0.10, can you reject the claim that the proportion of US adults who think that the Canadian government is doing too little to protect the environment hasn't changed?In the airline business, "on-time" flight arrival is important for connecting flights and general customer satisfaction. Is there a difference between summer and winter average on-time flight arrivals? Let x1 be a random variable that represents percentage of on-time arrivals at major airports in the summer. Let x2 be a random variable that represents percentage of on-time arrivals at major airports in the winter. A random sample of n1 = 16 major airports showed that x1 = 74.9%, with s1 = 5.3%. A random sample of n2 = 18 major airports showed that x2 = 70.2%, with s2 = 8.6%. 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 a small amount and thereby produce a slightly more "conservative" answer. (a) Does this information indicate a difference (either way) in the population mean percentage of on-time arrivals for summer compared to winter? Use α = 0.05. (i) What is the…I am needing help with how to answer this in R. 1. A [national survey](http://www.pewinternet.org/2012/11/01/how-teens-do-research-in-the-digital-world/) in 2012 showed that 75% of middle and high school teachers believe their students use Wikipedia for typical research statements. Let X equal the number of teachers in a random sample of size n = 40 who believe their students use Wikipedia. i) How is X distributed? ii) Use `plotDist()` to draw the probability distribution of X. iii) Compute the probability that X is equal to 30.
- A study of parental empathy for sensitivity cues and baby temperament (higher scores mean more empathy) was performed. Let x, be a random variable that represents the score of a mother on an empathy test (as regards her baby). Let x, be the empathy = 68.36. Another random sample of 31 fathers gave score of a father. A random sample of 37 mothers gave a sample mean of x, X, = 60.06. Assume that o, = 11.55 and o, = 11.45. (a) Let u, be the population mean of x, and let u, be the population mean of x,. Find a 99% confidence interval for u, - Hz. (Round your answers to two decimal places.) lower limit upper limit (b) Examine the confidence interval and explain what it means in the context of this problem. Does the confidence interval contain all positive, all negative, or both positive and negative numbers? What does this tell you about the relationship between average empathy scores for mothers compared with those for fathers at the 99% confidence level? Because the interval contains only…Magnetic surveying is one technique used by archaeologists to determine anomalies arising from variations in magnetic susceptibility. Unusual changes in magnetic susceptibility might (or might not) indicate an important archaeological discovery. Let x be a random variable that represents a magnetic susceptibility (MS) reading for a randomly chosen site at an archaeological research location. A random sample of 120 sites gave the readings shown in the table below.200 poodles 61 are left-paued left -pawed. a random sample of In a random sample ef 220 labradores 38 are Can we conclude that the difference in The tuo sample proportions of left pawed dogs is statistically significont for x= 0.05 ?