holders were more likely to have jobs), why would the chi-square test be inappropriate for this hypothesis? How should we analyze our data?
Q: Which of these two research objectives may be addressed using Chi-Square test of independence?
A: Chi square test of independence is used to determine whether two variables are dependent or not.
Q: A small pilot study is run to compare a new drug for chronic pain to one that is currently…
A: Given data and calculation of Rank is shown below
Q: If a variable of two populations has only two possible values, the chi-square homogeneity test is…
A:
Q: ) Marshall is superstitious and suspects that people who take the GRE while wearing the same dirty…
A: Let X1 and X2 be random variables such that X1: Marks of people who wore their lucky socks X2: Marks…
Q: An OB/GYN believes that the average gestation period for a first baby is longer than 39 weeks. What…
A: Given information- We have given that an OB/GYN believes that the average gestation period for a…
Q: Marshall is superstitious and suspects that people who take the GRE while wearing the same dirty…
A: The mean for the 'Lucky socks wearer" is given by, X1¯=∑iX1in=7657=109.2852 and the standard…
Q: What if Dr changed his design and instead of just measuring the presence or absence of SAGC he…
A: Given that in design four levels of SAGC are none, low, medium and high.
Q: What are the restrictions of use for a Chi-Square analisys?
A: The chi-square is very sensitive to sample size. As the sample size increases, absolute differences…
Q: Which of the following can cause OLS estimators to be biased? PLEASE EXPLAIN 1. Heteroscedasticity…
A:
Q: When walking down a narrow passageway, such as on a train, or between rows of lab benches, is it…
A: Given information: n = 30 x = 21 p^=xn=2130=0.70
Q: We can make a causal claim from the results of the chi-square test ? tru or false
A: False
Q: A chi-square test for homogeneity was conducted to investigate whether the four high schools in a…
A: Given: p-value of the test = 19.02 and 0.025
Q: Based on the data provided by the Environmental Protection Agency (EPA) in New York, we are…
A: State the null and alternative hypotheses for the above research question.
Q: In a random sample of 85 automobile engine crankshaft bearings, 10 have a surface finish roughness…
A:
Q: Researchers from the Department of Education are always looking for ways to improve methods of…
A: Chi square test is a non parametric test and distribution free test. Chi square test can be used…
Q: Suppose I’m using chi-square analysis to determine the relationship, if any, between a pair of…
A: Chi square test for independence is used to test determine if there is any significant relationship…
Q: A sample of 50 chewable vitamin tablets have a sample mean of 230 milligrams of vitamin C.…
A: Null and alternative hypotheses: Null hypothesis: Null hypothesis is a statement which is tested for…
Q: Show that Ti is unbiased estimator and Tz is biared estimator.
A:
Q: Which of the following can cause OLS estimators to be biased? PLEASE EXPLAIN
A:
Q: I have a hard time unndrestanding why this question is NOT statisical signifcant , I need a better…
A: The provided data includes an average weight loss of 41.41 lbs for 66 subjects in a weight loss…
Q: Explain the effect of effect size on power in relation with null hypothesis?
A: Power of a test: The probability that not occurring the type II error is called power of the test.…
Q: If we went ahead and used parametric statistics, even though our usual assumptions were NOT met,…
A: If parametric statistics are used even though the assumptions are not met, we will get unreliable…
Q: Identify situations in which it is important to estimate power in relation with null hypothesis?
A: A test of hypothesis consists of 2 hypotheses: the null, H0, and the alternative, H1. Power: The…
Q: The data collected in a research study well either support or refute the -that the study is designed…
A:
Q: Explain a projected hypothesis test be modified if you’re particularly concerned About the type I…
A:
Q: Out of an F test, Chi-squared t test, Two sample t test, and an One sample t test, the best test to…
A: We have to answer the question of, out of F test, Chi squared test, Two sample t test and an One…
Q: A biologist is studying the composition of birds on a lake and counts 61 ducks, 17 geese, 11 cranes,…
A: Statistical hypothesis testing is an important method in inferential statistics. It is used to test…
Q: A researcher selects a sample of 100 people to investigate the relationship between gender…
A: Solution: From the given information, out of 40 females 30 are registered voters. Out of 60 males 40…
Q: Give the degrees of freedom for the chi-square test based on the two-way table.
A:
Q: A Niave student collected data from a two-group randomzined group design without considering the…
A: The number of groups is 2.
Q: It is easier to reject the null hypothesis if the researcher uses a smaller alpha (α) level. choose…
A: We know that, Type I error is – In this we reject the null hypothesis which is actually true called…
Q: Which of the following can cause OLS estimators to be biased? PLEASE EXPLAIN. A sample correlation…
A: OLS i.e, ordinary least sqaure method is a process ofobtaining th estimates of unknown parameter in…
Q: Although the chi-square homogeneity test and the chi-square independence test use essentially the…
A:
Q: If we have a sample of size 100 with sample mean breaking strength of 975 pounds from a population…
A: Solution: Let X be the breaking strength. From the given information, x-bar = 975 pounds, S=200…
Q: A search engine optimization (SEO) company would like to know whether the market share in web search…
A: Given: Companies Google, Bing, Yahoo, and all others combined
Q: Perform a chi-square independence test, provided the conditions for using the test are met.…
A: Chi-square Analysis: For assessing categorical data from a randomly selected sample, the statistical…
Q: The chi-square goodness-of-fit test will be valid if the average of the expected cell frequencies is…
A: Introduction: The chi-square test for goodness of fit is suitable to test whether a given data set…
Q: Discuss the assumptions for one-sampled t-test and why they are important.
A: Assumptions:The assumptions that must be satisfied to ensure that the results are valid,…
Q: What is the difference between the goodness of fit and the test of independence in the chi-square…
A: Given data: What is the difference between the goodness of fit and the test of independence in the…
Q: What is a Chi-square test of independence? How is it helpful? Why is it used?
A: The chi-square test of independence is used when there are two categorical variables. It is mainly…
Q: I am testing whether a new group study technique improves PSYC 214 students’ final exam grades. In…
A: type 1 and type II error
Q: Marshall is superstitious and suspects that people who take the GRE while wearing the same dirty…
A: Given Information : Marshall is superstitious and suspects that people who take the GRE while…
Q: A random sample of 12 radon detectors of a certain type was selected, and each was exposed to 100…
A: Null hypothesis: µ=100. Alternative hypothesis: µ≠100. This is a two-tailed test. Here, the sample…
Q: Since the chi-square does not indicate the strength of the association, a researcher must then…
A: Chi-square test is used for observing whether there is any association between the variables or not.…
Q: If, however, you were unable to collect data of your own, then state this and explain why. Instead…
A: Given the data of the measurements that correspond to seedlings whose stems were cut during their…
Q: Marshall is superstitious and suspects that people who take the GRE while wearing the same dirty…
A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…
Q: A dean at a major university claims that the mean time for students to earn a Master's degree at the…
A: Solution: 2. The given claim is that the mean time for students to earn a Master’s degree at the…
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A: The cell contributes most to the chi-square test statistic is males who currently live in their…
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- In a detailed study of the productivity of a laboratory, the age distribution of its workers was analyzed, and the results were as follows, the kurtosis coefficient is equal toResearchers interested in lead exposure due to car exhaust sampled the blood of 52 police officers subjected to constant inhalation of automobile exhaust fumes while working traffic enforcement in a primarily urban environment. The blood samples of these officers had an average lead concentration of 124.32 µg/l and a SD of 37.74 µg/l; a previous study of individuals from a nearby suburb, with no history of exposure, found an average blood level concentration of 35 µg/l. Based on your preceding result, without performing a calculation, would a 99% confidence interval for the average blood concentration level of police officers contain 35 µg/l? Based on your preceding result, without performing a calculation, would a 99% confidence interval for this difference contain 0? Explain why or why not.Compute the forecasted values for Yt for July and August in 2020 by using the modelsstated in (c) and (d)
- Suppose your dependent variable is aggregate household demand for electricity for various cities. To correct for heteroskedasticity you should Select one: a. multiply observations by the square root of the city size b. multiply observations by the city size c. divide observations by the city size d. divide observations by the square root of the city size e. none of theseThe article “Withdrawal Strength of Threaded Nails” (D. Rammer, S. Winistorfer, and D. Bender, Journal of Structural Engineering 2001:442–449) describes an experiment comparing the ultimate withdrawal strengths (in N/mm) for several types of nails. For an annularly threaded nail with shank diameter 3.76 mm driven into spruce-pine-fir lumber, the ultimate withdrawal strength was modeled as lognormal with μ = 3.82 and σ = 0.219. For a helically threaded nail under the same conditions, the strength was modeled as lognormal with μ = 3.47 and σ = 0.272. a) What is the mean withdrawal strength for annularly threaded nails? b) What is the mean withdrawal strength for helically threaded nails? c) For which type of nail is it more probable that the withdrawal strength will be greater than 50 N/mm? d) What is the probability that a helically threaded nail will have a greater withdrawal strength than the median for annularly threaded nails? e) An experiment is performed in which withdrawal…1)A new starch polymer foam with high shock absorbent properties is expected to perform better thanthe old foam which can withstand a maximum impact of 1.56 Joule (J). A simple destructive testto quantify shock absorption ability of the new foam is conducted. Table 5 shows the impact energyabsorbed (in J) that the new foam can withstand for each test. Table 51.61 1.5 1.65 1.7 1.4 1.59 1.65 1.5 Does the recorded data suggests that the new foam performs better than the old foam? Use 2.5%level of significance. 2) A number of 28 university students who smokes completed a questionnaire inquiring their smokinghistory and behavior. The result shows that the average smoking initiation age of this group is 21.6years with a variance of 18.49. Based on past record, the smoking initiation age of universitystudent has a mean of 20.74 years with a standard deviation of 5.1 years. Conduct a necessaryanalysis to determine if the smoking initiation age remain the same as the previous record.…
- To see the effect of a relatively small error in the estimate of the amount of carbon-14 in a sample being dated, consider this hypothetical situation: a. A bone fragment found in central Illinois in the year 2000 contains 17% of its original carbon-14 content. Estimate the year the animal died. b. Repeat part (a), assuming 18% instead of 17%. c. Repeat part (a), assuming 16% instead of 17.Dyslexia refers to a specific reading disability that affects 10% to 15% of the general population. A dyslexic child is defined as a child of normal or above-normal intelligence with no known organic behavioural disorders who, despite normal schooling, shows a reading lag of at least two years. A researcher proposed that dyslexia was the result of a complex visual deficit that could be immediately corrected by simply putting a blue plastic overlay on the reading material. To test this, 100 dyslexic children were randomly assigned to one of two groups, one of which read from pages with a clear plastic overlay and the other of which read from pages with a blue plastic overlay. The dependent variable was percentage correct on a multiple-choice reading comprehension test. a) Is this an observational study or an experiment? Explain your choice. b) Why did the researcher use a clear overlay as one of the treatment groups instead of just having the children read the passage without an…Dyslexia refers to a specific reading disability that affects 10% to 15% of the general population. A dyslexic child is defined as a child of normal or above-normal intelligence with no known organic behavioural disorders who, despite normal schooling, shows a reading lag of at least two years. A researcher proposed that dyslexia was the result of a complex visual deficit that could be immediately corrected by simply putting a blue plastic overlay on the reading material. To test this, 100 dyslexic children were randomly assigned to one of two groups, one of which read from pages with a clear plastic overlay and the other of which read from pages with a blue plastic overlay. The dependent variable was percentage correct on a multiple-choice reading comprehension test. What assumptions for the hypothesis test would need to be conducted for a one sample t test? Which data on spss would i need to look at for the assumptions?
- Mr. X is a resident of Wakanda Ward who is concerned with the recent low turnout in local elections in this area. In an effort to understand the occurrence, Mr. Mbewe conducted research investigating the factors that drive an individual’s decision to participate in voting at Local Government level. He has managed to conduct and obtain an output from Stata but is struggling with results interpretation. The following are the output results from Stata: RSS = 28238.59 TSS= 35570.90 Adjusted R-squared = 0.2016 Constant = -0.762 Independent Variable Coefficient Standard Error P-value Income (in Kwacha) 0.310 - 0.003 Age (years) 0.358…A researcher hypothesizes that in a certain country the net annual growth of private sector purchases of government bonds, B, is positively related to the nominal rate of interest on the bonds, NI, and negatively related to the rate of inflation Π: Bt = a0 + a1NIt + a2Π t + ut Note that it may be hypothesized that B depends on the real rate of interest on bonds, R, where R = NI – Π. Using a sample of 56 annual observations, s/he estimates the following equations: (1) Bt = 0.43 + 0.90NIt - 0.97Πt R21 = 0.962, SSR1 = 2.20, QRESET(F1,52) = 16.6 (3.58) (8.80) (-1.05) (2) Bt = 0.44 + 0.94Rt R22 = 0.960, SSR2 = 2.22, QRESET(F1,53) = 0.9 (9.70) (16.7) (3) Bt = 0.44 + 1.14NIt SSR3 = 9.20, QRESET(F1,53) = 59.9 (8.84) (36.1) (4) NIt = 0.08 + 0.94Πt R24 = 0.997, SSR4 = 0.18, QRESET(F1,53) = 1.4…For some genetic mutations, it is thought that the frequency of the mutant gene in men increases linearly with age. If m1 is the frequency at age t1, and m2 is the frequency at age t2, then the yearly rate of increase is estimated by r = (m2 − m1)/(t2 − t1). In a polymerase chain reaction assay, the frequency in 20-year-old men was estimated to be 17.7 ± 1.7 per μgDNA, and the frequency in 40-year-old men was estimated to be 35.9 ± 5.8 per μg DNA. Assume that age is measured with negligible uncertainty.a) Estimate the yearly rate of increase, and find the uncertainty in the estimate.b) Find the relative uncertainty in the estimated rate of increase.