What is the null hypothesis in the Wilcoxon Signed-Ranks Test?
Q: Suppose that 550 out of 1000 people polled believe that this country needs immigration reform. Is…
A:
Q: A researcher uncovers that there is a significant interaction between the factor of marital status…
A:
Q: A tire store advertises that the average price of a new set of their tires is only $150. One of…
A: Hi, Since your question has more than 3 parts, we have solved only the first three subparts for you.…
Q: An article in the Washington Post on March 16, 1993 stated that nearly 45 percent of all Americans…
A: Given Sample size =78 X=30
Q: Assuming alpha level is held constant, if someone does a one-tailed test the critical value will…
A: Here, we use the concept of hypothesis testing.... When alpha is constant. (Given)
Q: A golf club manufacturer claims that golfers can lower their scores by using the manufacturer's…
A: As per the question we have Claim: - Golfers can lower their score by using the manufacturer’s newly…
Q: survey of students at a college was asked if they lived at home with their parents, rented an…
A:
Q: A researcher believes nurses are absent from work more frequently when they score higher on a test…
A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts. In case…
Q: Identify the null hypothesis, alternate hypothesis, test statistic, P-Value, conclusion about the…
A: Given Information: Sample size (n) = 85 Sample proportion (p^) = 5.9% = 0.059 Claim: production…
Q: did the team significantly improve its free throw percentage (left-tailed test)?
A: Let p1 and p2 be the two population proportions for the early home game and last home game…
Q: can you support the claim that the proportion of drivers who wear seat belts is greater in the South…
A: Given : x1= 404.0 n1= 490 x2= 279.0 n2= 380 significance level, 0.07
Q: If a test value is in the critical region with a=0.01, it would still be in the critical region…
A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are…
Q: A researcher did a one-tailed one-sample t-test to test the hypothesis that babies prefer the color…
A:
Q: A political pollster claims that 55% of voters prefer candidate A. To investigate this claim, a…
A: p=0.55 n=75
Q: Which of following is not true about Type I error? The alpha (a) level False positive Rejecting the…
A: We have to find type 1 error.
Q: One of your friends claims that as the outdoor temperatures get warmer, he can bench press more…
A: The given data is, High temp Bench temp 88 200 61 212 29 181 40 207 30 187 37 223…
Q: A fleet of rental cars - all the same make, model, and year - has a mean fuel efficiency of 24.1…
A: Type I error: The type I error is the rejection of the null hypothesis when it is actually true.…
Q: What is the critical value for a two-tailed t test when α = 0.02 and d.f. = 18?
A: Given that α=0.02 and df=18. We have to find the critical value for a two-tailed t test.
Q: The contingency table shows the results of a random sample of former smokers by the number of times…
A: Note: Since you have posted questions with multiple subparts we will solve the first three questions…
Q: Explain why the OLS estimator for the following model is inconsistent if random errors are serially…
A: Auxiliary regression: The regression mode that is used to test for the significance of…
Q: In mathematical statistics, Stat 100B, many test statistics are based on a gamma random variable…
A: Solution: The density function of the random variable which follows Gamma distribution is given. A…
Q: The contingency table shows the results of a random sample of former smokers by the number of times…
A: (a) The claim is that the number of times they tried to quit before they were habit-free is related…
Q: An article in the Washington Post on March 16, 1993 stated that nearly 45 percent of all Americans…
A: The null and alternative hypothesisH0:p=0.45Ha:p0.45sample size(n)=80x=30sample proportion()=
Q: g technique. TH nce in the pop
A: The Kruskal-Wallis H test, commonly known as "one-way ANOVA on ranks," is a rank-based…
Q: An article in the Washington Post on March 1616, 19931993 stated that nearly 45%45% of all Americans…
A:
Q: A batch of cookies is sent out for sale if more than 95% pass a yum test. Rather than test every…
A: The sample proportion is, p^=xn=245250=0.98 The sample proportion is 0.98. The test statistic is,…
Q: A random group of used books was selected from book warehouse to analyze their condition. The book…
A: Correct answer is (b)
Q: A researcher is testing a two-tailed null hypothesis at the p < .01 level with df = 45. What…
A:
Q: A team of researchers wants to investigate a relationship between students' self-esteem (variable X)…
A: The independent variabe is students' self esteem.The dependent variable is psychological…
Q: Find the critical value(s) for the t test for a left-tailed test with n=8 and a=0.05.
A: We have given that n = 8 α = 0.05 We have to find t test for a left-tailed test
Q: A two-tailed test at a 0.1031 level of significance has z values of a. -1.63 and 1.63 O b. -0.82 and…
A: Ans : The correct answer is : a. -1.63 and 1.63 Explanation : To determine which option represents…
Q: A researcher wanted to examine the effectiveness of Vitamin C on the number of colds a year. The…
A: Given: Colds 2 2 2 1 3 3 1 3 Mean, μ=3 Sample size, n=8 S.No Xi (Xi-X)2 1 2 0 2 2 0 3…
Q: An article in the Washington Post on March 16, 1993, stated that nearly 45 percent of all Americans…
A: Given,n=82x=30p^=xnp^=3082=0.366H0:p=0.45Ha:p≠0.45
Q: Heip A certain company's executives want to experiment with redesigning its restaurants so that the…
A: Thus, we have, s1 = 0.5799 s2 = 1.0065 n1 = 20 n2 = 20 ∝ = 0.05 The test hypothesis are,…
Q: A congressman is hoping that his bill is favored by his constituents to increase his chance of…
A: Given : Sample size (n)=150 Let X : No. of respondents who ae in favor of congressman bill X = 128
Q: What is the difference between the Wilcoxon Signed-Ranks Test and the Mann-Whitney U Test?
A: The Wilcoxon Signed-Ranks Test and the Mann-Whitney U Test are both non-parametric statistical tests…
Q: The Global Business Travel Association (GBTA) reported the domestic airfare for business travel for…
A:
Q: "You run a regression with 9 variables on Y with 40 observations. A t-stat of one of the variables…
A: Introduction: It is required to obtain the correct conclusion regarding the test of significance for…
Q: A researcher is conducting an experiment to evaluate the effectiveness of cognitive-behavioral…
A:
Q: Data was collected on the size of towns and the high school drop out rate. A left tailed hypothesis…
A: Given information- We have given a left-tailed hypothesis test was performed for r. Significance…
Q: A political strategist claims that 58% of voters in Madison County support his candidate. In a poll…
A: Given Information: Claim: 58% of voters in Madison County support the strategist's candidate. Sample…
Q: (d) Use a t-test to test if the relationship between years of experience and income is statistically…
A: The given data is entered in an excel sheet Years of experience Annual income (in thousands $)…
Q: Researchers followed a random sample of 2315 middle-aged men from eastern Finland for up to 30…
A: we have to perform a chi-square test of independence.
Step by step
Solved in 2 steps
- An article in the Washington Post on March 16, 1993 stated that nearly 45 percent of all Americans have brown eyes. A random sample of n=84 C of I students found 31 with brown eyes.We test H0:p=.45Ha:p≠.45 (a) What is the z-statistic for this test? (b) What is the P-value of the test?A researcher wants to test if the average performance of a new teaching method is different from the traditional teaching method in a sample of 25 students. The researcher used the Wilcoxon Signed-Ranks Test and obtained a T-value of 43. What can be concluded from the test result?In an early home game, an NBA team made 66 of their 100 free throw attempts. In one of theirlast home games, the team made 68 of 90 attempts. At α = .10, did the team significantlyimprove its free throw percentage (left-tailed test)?
- Imagine you are doing a Related-Samples t-test, and you are on Step Two of the hypothesis test. The sample of difference scores that you calculated is -1, -1, -3, +2, 0, -4. If you are doing the test with α = .01, and two tails, what would he correct t-critical be?note for drop downs in last question: performed > (worse than, similarly to, better than) random guesses , so they > (do not appear, appear) effective.When should the Wilcoxon Signed-Rank test be used instead of a paired t-test?
- A sociologist wishes to study whether the rank attained by officers in the New York City Police Department (NYPD) is related to gender. Data have been collected for both male and female officers in NYPD. The summary data and test for independence results from StatCrunch are given below. At a= 0.05 level of significance, draw a conclusion about whether these data indicate that the rank of the officer is independent of gender.(a) Is this an observational study or experiment?(b) What are the explanatory and response variables, respectively?Explanatory variable:Response variable:(c) Write down the null and alternative hypotheses of the test for independence.Contingency table results:Rows: RANKColumns: GENDER male female total officer 21900 4281 26181 detective 4058 806 4864 sergeant 3898 415 4313 lieutenant 1333 89 1422 captain 359 12 371 higher ranks 218 10 228 total 31766 5613 37379A major oil company has developed a new gasoline additive that is supposed to increase mileage. To test this hypothesis, ten cars are randomly selected. The cars are driven both with and without the additive. The results are displayed in the following table. Can it be concluded, from the data, that the gasoline additive does significantly increase mileage? Let d=(gas mileage with additive)−(gas mileage without additive)�=(gas mileage with additive)−(gas mileage without additive). Use a significance level of α=0.05�=0.05 for the test. Assume that the gas mileages are normally distributed for the population of all cars both with and without the additive. Car 1 2 3 4 5 6 7 8 9 10 Without additive 27.2 13.7 12.5 13.4 14.7 25.5 10.3 13.9 14.5 25 With additive 29.7 15.7 14.1 16.4 17.8 27.8 12.1 15 17.3 28 Copy Data Step 1 of 5: State the null and alternative hypotheses for the test.Bocellie rejected a null hypothesis. The reason for doing this is that the hypothesis required a right-tailed test and the t value was 2.5 whereas the t critical value was 2. Which of the following are we certain about: Both Type I and Type II error were made A Type II error was not made Neither Type I nor Type II error was made A Type I error was not made
- Foofy obtained a significant Fobt from an experiment with five levels. She therefore concludes that changing every condition of the independent variable results in a significant change in the dependent variable. (a) Is she correct? Why or why not? (b) What must she now do?Does training in stress reduction make a difference for student success? 15 students received training (M1= 88, SS1= 400) and 15 students did not (M2= 82, SS2= 440). Test using α = .05 Which is the null hypothesis, H0?700 doctors went through extra training compared to 1200 doctors who did not. Of the doctors who went through extra training, 125 of them majored in psychology. Of the 1200 doctors who did not do extra training, 174 of them majored in psychology. Perform a hypothesis test to see if there is a statistically significant evidence that the proportion of doctors who went through extra training is significantly greater than the proportion of doctors who did not. Perform the test at the alpha = .5 level. What is the p value and conclusion of this test?
