Samples that are not chosen randomly from the population might exhibit bias True False
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A: Given data An employee claims that 20% of the email she receives is personal 60% is work related and…
Q: It is believed that 11% of all Americans are left-handed. A college needs to know the number of…
A: As per the question we have 11% of all Americans are left-handed College recorded whether the…
Q: The National Academy of Science reported that 38% of research in mathematics is published by US…
A: Solution: Given data p = 0.38 Sample size( n) = 279 x = 123 Level Of significance = 0.02 To Test the…
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Q: The National Academy of Science reported that 36% of research in mathematics is published by US…
A: Given p=36%, n=278, X=85 Level of significance ɑ=0.02
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A: Sample size (n) = 173Population proportion (p) = 0.08Thus,
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A: Solution: Given information: n= 4 Sample size x= 62.1 minutes Sample mean μ=55 minutes Population…
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A: Given the data as X1 X2 5 2 4 1 3 0 4 3 2 2 1 1 6 3 2 4 4 2
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A: Two-sample t-test is used to compare the means between two independent groups and paired t-test is…
Q: The National Academy of Science reported that 33% of research in mathematics is published by US…
A: sample size(n)=280No.of articles have US authors(x)=108significance level(α)=0.01
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A: Given: Significance level α = 0.05 For option-1: Sample size n1 = 250 Sample mean X1 = 17.6 Sample…
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A: Anova stands for Analysis of variance. It is used to analyze the difference between the means of…
Q: The National Academy of Science reported that 31% of research in mathematics is published by US…
A: Given : Hypothesized proportion : p0=0.31 Claim : Proportion is different from 0.31 . Sample size :…
Q: 1. For this problem, treat the data in the Pre-Module and Post-Module scores as independent samples.…
A: Given: The data in pre-module and Post module scores are independent samples. Sample size of both…
Q: One cable company claims that it has excellent customer service. In fact, the company advertises…
A:
Q: An environmentalist wishes to conduct a hypothesis test on the percentage of cars driven in the city…
A: Sample size(n)=143 Population proportion(P)=0.04 q=1-p q=1-0.04=0.96
Q: It is traditionally believed in the literature on bird migration that godwits that migrate between…
A: In hypothesis testing, there are always two hypotheses - null hypothesis and alternative hypothesis.…
Q: The National Academy of Science reported that 37% of research in mathematics is published by US…
A:
Q: If a researcher describes a factorial design as a 2 x 2 ANOVA, what does this mean?
A: Given information: A factorial design is given.
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A: Given : n1=205 , n2=270 , X1-bar=17.7 , X2-bar=18.3 , s1=5.1 , s2=4.1 , α=0.05 Here , we want to…
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Q: (a) State the null hypothesis H and the alternate hypothesis H₁. H₁:0 H₁:0 (b) Determine the type of…
A: a) The hypotheses for the test are, H0:μ1=μ2H1:μ1≠μ2 The test is two-tailed.
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A: Solution: Given information: Option 1 sample statistic are n1= 265 x1 = 17.6 s1= 4.7Option 2 sample…
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A: Proportion of people who able to identify the soda = 53/80 = 0.6625 n = 80
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A: One tailed Ha : If hypothesis specifies direction of effect that test is one tailed . Two tailed Ha…
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A: An email is sent to everyone at a school, encouraging students to participate in a school-wide…
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Q: The National Academy of Science reported that 37% of research in mathematics is published by US…
A: we have to find test statistics..
Q: it is traditionally believed in the literature on bird migration that godwits that migrate between…
A:
Q: The National Academy of Science reported that 31 % of research in mathematics is published by US…
A: p=0.31 n=188 x=74
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A: From the provided information, Sample size (n) = 30 Variance (σ2) = np (1-p) = 3.7
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A: (a) The null and alternative hypotheses need are: Ho: \muμ = 250250 Ha: \muμ < 250250 This…
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A: The hypothesis is, Null hypothesis: H0:p1-p2≥0 Alternative hypothesis: H1:p1-p2<0 The sample…
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Q: The National Academy of Science reported that 33% of research in mathematics is published by US…
A: This problem can be solved using z test for proportion. The formula for the z test statistic is…
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A:
Samples that are not chosen randomly from the population might exhibit bias
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- One cable company claims that it has excellent customer service. In fact, the company advertises that a technician will arrive within 55 minutes after a service call is placed. One frustrated customer believes this is not accurate, claiming that it takes over 55 minutes for the cable technician to arrive. The customer asks a simple random sample of 4 other cable customers how long it has taken for the cable technician to arrive when they have called for one. The sample mean for this group is 62.1 minutes with a standard deviation of 8.3 minutes. Assume that the population distribution is approximately normal. Test the customer’s claim at the 0.05 level of significance. Step 2 of 3 : Compute the value of the test statistic. Round your answer to three decimal places.A random sample of 100 rich men faculty and 100 rich women faculty at a Premier University is asked if they have an automobile on campus. If 31 of the rich men and 24 of the rich women have cars, can we conclude that more men than women have cars on the campus? Use a 0.01 level of significance.The National Academy of Science reported that 41% of research in mathematics is published by US authors. The mathematics chairperson of a prestigious university wishes to test the claim that this percentage is no longer 41%. He has no indication of whether the percentage has increased or decreased since that time. He surveys a simple random sample of 186 recent articles published by reputable mathematics research journals and finds that 92 of these articles have US authors. Does this evidence support the mathematics chairperson’s claim that the percentage is no longer 41%? Use a 0.05 level of significance. Step 1 of 3: State the null and alternative hypotheses for the test. circle the answer below. H0 p=0.41 ha: p⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯0.41 A.<B.≠C.> Step 2 of 3: Compute the value of the test statistic. Round your answer to two decimal places Step 3 of 3: Draw a conclusion and interpret the decision. A. We reject the null hypothesis and conclude that there is insufficient evidence at a…
- True or False: Suppose I conducted a study using random assignment. This suggests that I took great effort to ensure that all of my subjects had an equal chance of being in either group.An industrial psychologist feels that a big factor in job turnover among assembly line workers is the individual employee’s self-esteem. She thinks that workers who change jobs often (Population A) have, on the average, lower self-esteem, as measured by a standardized test, than workers whodo not (Population B). To determine whether she can support her belief with statistical analysis, she draws a simple random sample of employees from each population and gives each a test measuring self-esteem. The results are as follows: Group A 60 45 42 62 68 54 52 55 44 41 Group B 70 72 74 74 76 91 71 78 76 78 83 50 52 66 65 53 52 The psychologist believes that the relevant population scores are normally distributed, with equal, although unknown, variances. At the 0.1 level of significance, what should she concludedetermine the degrees of freedom if necessary
- The National Academy of Science reported that 33 % of research in mathematics is published by US authors. The mathematics chairperson of a prestigious university wishes to test the claim that this percentage is no longer 33 %. He has no indication of whether the percentage has increased or decreased since that time. He surveys a simple random sample of 280 recent articles published by reputable mathematics research journals and finds that 108 of these articles have US authors. Does this evidence support the mathematics chairperson's claim that the percentage is no longer 33 % ? Use a 0.01 level of significance. Step 1 of 3: State the null and alternative hypotheses for the test. Fill in the blank below. Answer Ho :p = 0.33 Ha P O # ο ο ο HAV O < 0.33 Tables Keypad Keyboard ShortcutsAn environmentalist wishes to conduct a hypothesis test on the percentage of cars driven in the city that are hybrids. Is it sufficient for him to use a simple random sample of 173 cars if hybrids currently account for 8%of the car sales in the country and he claims that the percentage of hybrids in the city is higher than that?An educator believes that the proportion of finance majors seeking to earn an MBA degree equals the proportion of management majors seeking to earn an MBA degree in the population. A random sample of 100 finance majors is taken and 24 indicate that they will seek to earn an MBA degree. Likewise, a random sample of 400 management majors is taken and 65 indicate that they will seek to earn an MBA degree. Using this information, test the educator’s claim at the 0.05 level
- A campus administrator has found that 60% of all students view courses as very useful, 20%, as somewhat useful, and 20%, as worthless. Of a random sample of 100 students taking business courses, 68 found the course in question very useful, 18, somewhat useful, and 14, worthless. Test the null hypothesis that the population distribution for business courses is the same as that for all courses.The dataset "nurses" is a random sample of 1,000 cases from “Health Care Provider Credential Data” from Washington State Open Data Portal. In the sample, there are 418 CNA's and 278 of the CNA's have expired credentials. Use the statistics from the nurses dataset to answer the following question: "With 90% confidence, what percent of all CNA's on Washington State's healthcare provider list are expired?"A significant result in an ANOVA indicates that A)the means of two groups are different, B)there is a significant effect of random variance. C)there is a significant effect of systematic variance. D)the intercept of the regression line is not zero.