An SEO account manager is concerned website developers are using too many keywords per web page. The SEO account manager would like to carry out a hypothesis test and test the claim that a web page has, on average, more than 10 keywords. Why is this hypothesis test right-tailed?
Q: A bookstore is trying to predict how many of a new fantasy book will sell. They form a model to…
A: Given that: Day Monday Tuesday Wednesday Thursday Friday Number of copies sold 74 97 91 86 112…
Q: % of According to a book published in 2011, 45% of the undergraduate students in the United States…
A: Stating the appropriate null and alternative hypotheses: The hypotheses are given below: Null…
Q: Gallup is a polling company that aims to make predictions about American opinions. From August…
A: The statistic is a function of sample values only. And parameter is based on population values.…
Q: What is hypothesis testing?
A: Hypothesis test: The process of making inference regarding the population based on the sample is…
Q: Discuss what the two populations are in a hypothesis test?
A: *Answer: Hypothesis Testing: Two Population Means - Independent Samples, Unknown Population…
Q: A manager decided that if more than 80% of users are classified as potential buyers, they will…
A: Given that, Percentage of users who are potential users (p) = 80% = 0.80 Explain how would work the…
Q: Assume that adults were randomly selected for a poll. They were asked if they "favor or oppose using…
A: Solution: Given information : n = 490 favor + 395 opposed = 885 sample size X = 490 favor…
Q: Researchers prefer conducting z tests because it gives us more than enough information to make…
A: Given statement: Researchers prefer conducting z tests because it gives us more than enough…
Q: Is the following a non-directional (two tailed) or directional (one tailed) hypothesis? Students…
A: Given : Claim : Students who sit in the front of the class have a different average grade compared…
Q: Is there enough evidence, at a a = 0.01 level of significance, to show a difference between the…
A: The provided sample means are shown below: Xˉ1=578\bar X_1 = 578 Xˉ2=570\bar X_2 = 570 Also, the…
Q: A business magazine mailed a questionnaire to the treasurers of all of the Top 400 most profitable…
A: Given: Identify any potential sources of bias and any issues you find with generalizing the…
Q: WonderGym is a new gym in town. They are planning some promotional programmes to draw in customers…
A: Gym conducted 2 types of exercise classes. We have to test whether there is a change in the muscle…
Q: A 2012 survey of 2247 American adults indicates that 16% of cell phone owners do their browsing on…
A: A z-test for two proportions is a hypothesis test that attempts to make a claim about the population…
Q: Phineas Phillips, from Philadelphia, has a fascination with fun phone facts. But Phineas has…
A:
Q: Potential buyers for a new car were randomly divided into two groups. One group was shown the "A"…
A: Here, the potential buyers for a new car were divided into two groups. The researcher wants to…
Q: A social psychologist was interested in finding out whether the effect of leadership style on the…
A: For Democratic Leadership: For Autocratic Leadership:
Q: A teachers looks over her class and notices a few trends. Out of the 60 students in the class,…
A: According to the provided data, the total number of students are 60 out of which 23 have brown hair,…
Q: A researcher hypothesizes that the average student spends less than 20% of their total study time…
A: Answer:- A researcher hypothesizes that the average student spends less than 20% of their total…
Q: The term “bleeding heart liberal” is due to the (supposed) excess sympathy that liberals feel for…
A:
Q: According to a guide, 47% of cell phone users have only one cell number, 32% have two numbers, 9%…
A: We have given that p1=47%, p2=32%, p3=9%, p4=12% Cell number Observed Frequency=O One cell…
Q: A Harris Interactive poll reported that 32.4% of 275 randomly selected Americans living in the west…
A: Denote p1, p2 as the true population proportions of Americans living in the west and south,…
Q: A survey of 1200 TV households showed that 53.5% of them had at least one stand-alone streaming…
A: Let p be the population proportion p=majority=1/2=0.50=50%, n=1200, p^=sample…
Q: I need to find the test statistic and value
A: The hypotheses are given below: Null hypothesis: H0:p=0.5. Alternative hypothesis: H1:p<0.5.…
Q: The Center for Entrepreneurship is seeking to offer programs to aid students who are interested in…
A: Given data is appropriate for testing of hypothesis to test t-test for difference of means, because…
Q: When might we want to test a non-directional (two-tailed) hypothesis, as opposed to a one-tailed…
A: If we want to test if the population parameter is more than a particular value or variable we use a…
Q: A criminal psychologist is interested in whether individuals in high power corporate positions are…
A: a) The null and alternate hypothesis is H0 : μ1=μ2=μ3 HA : Not all the population means are equal b)…
Q: The new screening found 250 positives, of which 80% were true positives. Full diagnostic testing…
A: Here Given , A new imaging technology is being devised as an early screening for brain cancer. Five…
Q: Do people who work for non-profit organizations differ from those who work at for-profit companies…
A: Let be the number of delighted employees at "non-profit" and "for-profit" organizations. For…
Q: What is the formula for a two tailed test?
A: In two-tailed test the critical area of a distribution is two-sided. If the sample being tested…
Q: Under what research situation would a researcher use a one-tailed test rather than a two-tailed…
A: A two-tailed test is known to be a test carried out to show if the mean of the sample is…
Q: Which of the three independent variables are significantly related to sales performance (at a =…
A: The tests are conducted at 5% level of significance that is alpha=a= 0.05 A independent variable is…
Q: TOR is free and open-source web browser (https://www.torproject.org/) enabling anonymous…
A: Given: Total No. of students studied = 234 No. of students with favorable outcome (who had heard of…
Q: Why is A incorrect? Will it not lead to voluntary response bias? How about B and C? Why are they…
A: GivenThirty employees volunteered, and each employee used the new desk chair for two weeks and also…
Q: 3. Today, in a random sample of 30 people, Trump received an approval rating of 30% world- wide. On…
A:
Q: Describe, in your own words, the difference between a one-tailed and two-tailed test within the…
A: Null hypothesis : Any hypothesis tested for its possible rejection is called a null hypothesis. It…
Q: What is the strength of evidence against observed study results happening by chance alone? O Very…
A: Here, we have to find the strength of evidence against observed study results happening by chance…
Q: An HR expert at an insurance company is considering the introduction of personality tests in the…
A: The dependent variable is SALES.
Q: Why hypothesis testing is very important
A:
Q: Model 1 Regression Residual Model 1 Sum of Squares 10333.355 (Constant) Extraversion 24242.384…
A: Here the given output, indicates that there are three predictor variables Agreeableness,…
Q: A researcher gathered a sample of participants who volunteered for a studying of phobias. She…
A: A researcher gathered a sample of participants who volunteered for a studying of phobias. She…
Q: Country Magazine reports that celebrity MySpace accounts have an average of 4 million friends.…
A: We have given that, Mu = 4 , Xbar = 3 , n =43 . We have to find , Which is the best set of…
An SEO account manager is concerned website developers are using too many keywords per web page. The SEO account manager would like to carry out a hypothesis test and test the claim that a web page has, on average, more than 10 keywords. Why is this hypothesis test right-tailed?
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 2 images
- According to the GSS 2018 dataset, 51% of 218 college graduates reported being interested in environmental issues compared with 43% of 167 high school graduates. What is the research hypothesis? Should you conduct a one- or two-tailed test? Why?An HR expert at an insurance company is considering the introduction of personality tests in the process of recruiting sales agents. It is hypothesised that certain personality traits may contribute to being a successful sales agent, and therefore personality profiles can be used to select the best applicants for open positions. The introduction of personality measures in the recruitment process, however, is only meaningful if there is evidence that certain personality characteristics are related to job performance. To test whether success in this occupation is related to personality features, the expert conducts a study, in which a random sample of currently employed sales agents fill in a questionnaire measuring three traits: (1) extraversion, (2) conscientiousness and (3) agreeableness. Each trait is measured on a scale ranging between 0 and 10 points. To test whether the annual total value of insurance policies sold by an agent can be predicted from personality scores, a multiple…Dr. Moo conducted a research project in which she compared the impact of two types of therapy (pizza therapy and chocolate therapy) and gender on college students’ happiness. How many null hypotheses did she have, and how would you write them?
- Forbes reports that women in general trust recommendations from Pinterest more than recommendations from any other social network platform. But does trust in Pinterest differ by gender? The following sample data show the number of women and men who state in a recent survey that they trust recommendations made on Pinterest. Sample Trust recommendations made on Pinterest Women 150 117 Men 170 102 We want to determine whether trust in Pinterest differ by gender. Formulate the null and the alternative hypotheses. Use 1 to represent women and 2 to represent men. H0: Ha: Null: p1 – p2 ≥ 0; Alternative: p1 – p2 < 0 Null: p1 – p2 = 0 ; Alternative: p1 – p2 ≠ 0 Null: p1 – p2 ≤ 0; Alternative: p1 – p2 > 0 B. What the test statistics? You probably need to find the pooled proportion first. Pooled proportion is ___________. 0.6 0.78 0.6844 C. Test statistic is ________. 3.46 1.28 66.41 4.36Suppose you want to find out how many people support Policy X. A standard polling approach is to just ask N many people whether or not they support Policy X, and take the fraction of people who say yes as an estimate of the probability that any one person supports the policy. Suppose that the probability someone supports the policy is p, which you do not know. Let îy be the number of people polled who supported the policy, divided by the total number of people polled N. However, a problem with polling is whether or not people are willing to answer honestly. If a question might be viewed as shameful or embarrassing (about politics, sexual activity, or whatever people are sensitive about), they may be reluctant to answer honestly. A potential solution to this is the following: suppose that 'YES' is the embarrassing or socially shameful answer; give the people you are polling the following instructions: flip a coin privately, and if it comes up heads answer honestly, but if it comes up…A researcher takes a sample of 50 individuals and administers a background check to identify the number of prior arrests for each person. For whatever reason, one person is removed from the analysis and another random person is selected to replace that person. Having no additional information, what is your best guess of the number of prior arrests experienced by the replacement person? Why?
- There is some research to indicate that different dog breeds differ in emotionality. To consider these differences, a researcher administers a standard test of emotionality to 3 breeds of dogs (German Shepherd, Cocker Spaniel, and Chihuahua), with 4 dogs from each breed being tested. Higher scores mean higher emotionality. The results for the emotionality test scores appear below. Using the 7 steps of hypothesis testing, test the idea that there are differences in emotionality based on dog breed using α = .05 Emotionality Scores for Dogs German Shepherd Cocker Spaniel Chihuahua 6 0 10 1 4 12 7 0 9 2 0 8 T = 16 T = 4 T = 39 Gt = 59 N = 12 ∑x2 = 495 4. Decision Rule (Be sure to include your critical value) 5. Do your calculations 6. Make your decision 7. State your results in a sentence. Report your results in APA style including a measure of effect size. Be sure to include descriptive statistics (M). 8. Given your decision in #7, would…A political scientist claims that 38% of first-year college students characterize themselves as being “moderate” or “middle of the road” as far as their political affiliation is concerned. Believing this claimed value is too high, you survey a random sample of 400 first-year college students and find that 120 characterize themselves as being “moderate” or “middle of the road.” Based on this information, what will the test statistic be? Choose the answer below that is closest to what you calculate, and try not to do a lot of rounding until you get to the very end of your calculations. 1. -0.3 2. -1.2 3. -2.6 4. -3.3 5. None of the other answer options are correct because the test statistic should be positive, not negative.Does the source of medical information affect people’s confidence that it is true? To answer this question, you presented medical information to participants regarding the importance of vaccinations. Participants were randomly assigned to read medical information from a doctor, a politician, or a celebrity. Then, they indicated how confident they were that the information is true.
- According to a book published in 2011, 45% of the undergraduate students in the United States show almost no gain in learning in their first two years of college (Richard Arum et al., Academically Adrift, University of Chicago Press, Chicago, 2011). A recent sample of 1540 undergraduate students showed that this percentage is 37%. Can you reject the null hypothesis at a 2.5% significance level in favor of the alternative that the percentage of undergraduate students in the United States who show almost no gain in learning in their first two years of college is currently lower than 45%. Use both the p-value and the critical-value approaches. Round your answers for the observed value of z and the critical value of z to two decimal places, and the p-value to four decimal places. Zobserved = p-value = Critical value = i Hence we can conclude that the percentage of undergraduate students in the U.S. who show almost no gain in learning in their fırst two years of college is currently 45%.Suppose that major new legislation was recently passed by the government. Fourteen economists were sampled and asked to predict if the national economy would improve during the next 12 months compared to its present state as a result of this legislation. Eight of the economists predicted an improvement, two economists predicted no change, and four economists predicted a decline in the economy. Conduct a hypothesis test at the 0.10 significance level to determine if the majority of economists predict an improvement in the economy. What is the decision rule? Multiple Choice Reject Ho if the number of economists predicting an improvement is > 8. Reject Ho if the number of economists predicting an improvement is > 11. Reject Ho if the number of economists predicting an improvement is > 10. Reject Ho if the number of economists predicting an improvement is > 9.The Literary Digest was an American magazine that ran from 1890–1938. The magazine was famous for correctly predicting presidential winners since 1916 based on poll results. In 1936, however, it erroneously predicted that Alfred Landon would defeat Franklin Delano Roosevelt. This fiasco ultimately resulted in the magazine going out of business. The reason for The Literary Digest’s incorrect results has been studied throughout the years and is a famous example in statistics classes. One reason that researchers have found for the faulty results is that even though the magazine polled ten million people, the return rate of the surveys was around 23%. What type of bias is this? voluntary response bias non-response bias self-interest study loaded questions sampling bias perceived lack of anonymity response bias