Eight students were given a pretest to measure their public speaking anxiety. They completed a workshop and then were given a post test. At αα =0.05, did the workshop lower their anxiety (a lower score indicates a lower anxiety level)? Pretest 23 26 30 31 39 23 28 27 Post test 22 29 27 29 33 21 25 28 A. Determine the critical value. B. Determine the test statistic. Using Wilcoxon signed rank test.
Q: Source of Variation Treatments Error Total ܓ =ܨ ܢܕ "ܨ ܐܐ Tܕ ܐܐ ܙ ܕܐ PPPPPs Ob The null hypothesis…
A: From ANOVA table Degree of freedom for treatment=dftreatment=3
Q: 1 c) A population is the collection of all items of interest in a particular study.
A: Population is each and every unit of items in a study of interest, whereas, sample is a part of…
Q: d. The middle 50% of her laps are from seconds to seconds.
A: Denote the random variable X as the number of seconds. Thus, X~ N (129.23, 2.28).
Q: The mean daily production of a herd of cows is assumed to be normally distributed with a mean of 39…
A:
Q: In a jar of ten beads, seven are red and three are blue. A bead is drawn from the jar five times…
A:
Q: 1. A normal distribution has a mean m = 58 with s= 2. What is the probability of selecting an…
A: As per our guidelines we are suppose to answer only one question1)GivenMean(m)=58standard…
Q: potheses on of housiria units in the county that are vacant be d 0.157 0.157
A: In above statement let the proportion of housing unit in the country that are vacant be denoted by p…
Q: If the area under the Standard Normal ourve and to the left of z-soore le 1, then the z-score value…
A: It is given that The area under the standard normal curve and to the left of z-score is 1.
Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 261 days…
A:
Q: p=0.95H0:p=0.95 H1:p>0.95H1:p>0.95 Your sample consists of 87 subjects, with 79 successes.…
A: Given data,p=0.95No of subects n=87No of success x=79p'=xn=7987=0.89test statistic z=?
Q: The t distribution is used when the population distribution is normal and Select one: O a. Both a…
A: t-distribution: The t-distribution is a type of prob. distribution that is similar to the normal…
Q: In a survey, 15 people were asked how much they spent on their child's last birthday gift. The…
A:
Q: Let S (x, y) = 4(x + y) 5x³ pdf with 14-16 then the value of A which make this probability true is…
A:
Q: 3. Travelers who have no intention of showing up often fail to cancel their hotel reservations in a…
A: In the given scenario, the number of overbooking in a hotel was observed. The data showed the…
Q: Based on historical data, your manager believes that 29% of the company's orders come from…
A:
Q: For the following information on a data set: Measurement Class .00-.75 .75-1.50 1.50-2.25 2.25-3.00…
A: The relative frequencies of a data set are given.
Q: a. Which of the following best represents a set of numerical data? mean proportion variance range…
A: Given, a. Which of the following best represents a set of numerical data?meanproportionvariancerange
Q: 6. A discrete random variable can assume 5 possible values, as listed in the accompanying…
A:
Q: Contingency Tables and Conditional Probability: Homework and Passing a Course A teacher categorized…
A: Given data is Completed HW Did not complete HW Total Passed the course 27 8 35 Did not pass…
Q: If n=210 and p' (p-prime) = 0.41, construct a 99% confidence interval. Give your answers to three…
A:
Q: In a test of the effectiveness of garlic for lowering cholesterol, 42 subjects were treated with…
A: In the given, the confidence interval of the before and after use of garlic for lowering cholesterol…
Q: Which one of the following is not a valid number for a probability? O a. 0.32 Ob. 17% O c. 0 Od.…
A: To find: Which one of the following in not a valid number for a probability.
Q: In a test of a gender-selection technique, results consisted of 226 baby girls and 13 baby boys.…
A: The answer is attached below,
Q: A) Following is a boxplot for the data above is it reasonable to assume that the condition for…
A: Given:- The time is taken by each rat to navigate the maze field and a box plot is given. To check:-…
Q: Travelers who have no intention of showing up often fail to cancel their hotel reservations in a…
A: The sample mean is calculated as follows: x=∑xn =18+16+16+16+14+18+16+18+14+1910 =16.5
Q: S The age of professional racecar drivers is normally distributed with a mean of 28 and a standard…
A:
Q: A class of eleven people received the test scores shown below, sorted by score. 32 51 69 73 74 75 82…
A: The data is arranged in ascending order.
Q: Graph the following observations of x and y 13 38 Determine the straight line that fits these data.…
A: Regression: The regression analysis is conducted here by using EXCEL. The software procedure is…
Q: Sale amounts during lunch hour at a local subway are normally distributed, with a mean $7.56, and a…
A: Since you have posted a question with multiple sub-parts, we will solve first 3 sub-parts for you.…
Q: For the given data set, find the: a) mean b) median c) mode
A: Given information: 27,57,34,62,27,54,27,41,43,41. a) Mean: Mean=sum of valuesNumber of values…
Q: 3. Travelers who have no intention of showing up often fall to шег travelers are known, in the…
A: Given data: 18, 16, 16, 16, 14, 18, 16, 18, 14, 19 The objective is to count the number of…
Q: The following data show the monthly rental price (in $) for a random sample of one- bedroom…
A: Given :- Mean=700 Tabular data of monthly rental price.we need to determine the median,variance.…
Q: 16% 12% 8% 4% 2 6 LI 1 0 10 14 Histogram of Final Exam Scores 100 20 30 Scores About what percent of…
A: In the discipline of statistics, the histogram is one of the most popular and significant graphical…
Q: Assume there is a certain population of fish in a pond whose growth is described by the logistic…
A: The starting population is given as p0=100 The growth is 240% per year and the growth rate is 2.4…
Q: You wish to test the following claim (HaHa) at a significance level of α=0.01α=0.01.…
A: Given,sample size(n)=227sample mean(M)=78.2sample standard…
Q: Using the data in the table below, construct a weighted 3-Period Moving Average Period Actual…
A:
Q: The probability of winning a large stuffed animal in the ring-toss game at a fair is 10%. a) Using a…
A: a) For large sample size (n>30), binomial distribution can be approximated to normal distribution…
Q: Based on a survey, assume that 31% of consumers are comfortable having drones deliver their…
A: From the above question The values of n is 6
Q: A bag contains 4 red shirts, 6 blue shirts, and 8 black shirts. If a shirt is randomly selected from…
A: The provided information is A bag contain 4 red shirts, 6 blue shirts, and 8 black shirts The…
Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 4.9…
A: Given: μ = 4.9 years. σ = 1.2 years. Probability = 4% = 0.04 Formula Used: Z-score = X-μσ X = μ+Zσ
Q: - and 3 4.8 and 3.5 4 and 3.33 18 or
A: Given Data = ,1,7,3,3,6,4
Q: If n=20, ¯xx¯(x-bar)=46, and s=2, find the margin of error at a 90% confidence level Give your…
A:
Q: Let X represent the number of games (out of 840) that you win. Find the standard deviation for the…
A: It is given that Population Proportion, p = 0.48 Sample size, n = 840 Mean, μ = np = 403.2
Q: 2. For the following information on a data set: Measurement Class .00- .75 .75-1.50 1.50-2.25…
A:
Q: find the area to the right of z=-0.71 under standard normal curve
A:
Q: The probability of winning a large stuffed animal in the ring-toss game at a fair is 10%. a) Using a…
A: Given that the probability of winning a large stuffed animal in the ring-toss game at a fair is 10%.
Q: According to a report done by S & J Power, the mean lifetime of the light bulbs it manufactures is…
A: 1. The provided information is n=20x¯=45σ=7α=0.01The null and alternative hypothesis is…
Q: What is the best estimate of the mean household income in this county?
A:
Q: 2. The average number of workers in various income categories in 227 textile companies is…
A: Given data: Income Groups Number of Companies Workers 1000-1200 39 12 1200-1400 48 13…
Q: CNNBC recently reported that the mean annual cost of auto insurance is 963 dollars. Assume the…
A: Given Mean=963 Standard deviations=282
Eight students were given a pretest to measure their public speaking anxiety. They completed a workshop and then were given a post test. At αα =0.05, did the workshop lower their anxiety (a lower score indicates a lower anxiety level)?
| Pretest | 23 | 26 | 30 | 31 | 39 | 23 | 28 | 27 |
| Post test | 22 | 29 | 27 | 29 | 33 | 21 | 25 | 28 |
A. Determine the critical value.
B. Determine the test statistic.
Using Wilcoxon signed rank test.
Step by step
Solved in 2 steps
- The NAEP considers that a national average of 283 is an acceptable performance. Using α = .05, run a two-tail t-test for one sample to test Ho: µ=283 for the 2019 scores. Report the t-obt, df, and p-values. Would you reject the null hypothesis that the 2019 scores come from a population with average 283? If this is the case, does it come from a population from larger or smaller average?A random sample of 100 freshman showed 6 had satisfed the university mathematics requirement and a second random sample of 50 sophomores showed that 13 had satisfied the university mathematics requirement. Enter answers below rounded to three decimal places. (a) The relative risk of having satisfied the university mathematics requirement for sophomores as compared to freshmen is (b) The increased risk of having satisfied the university mathematics requirement for sophomores as compared to freshmen isA nationwide study of undergraduate students reported that the mean number of drinks consumed per week during the spring semester is 7.96. The mean number of drinks consumed per week at USC is 7.64 (s.d.=2.55, N=412 Health services is concerned that USC students are consuming significantly more alcohol per week than the national average. Using an alpha level of .05, Is there sufficient evidence to be concerned? Be sure to select the correct critical value for the alternative hypothesis, and then use this evidence to make your conclusion
- In the population of senior students at Shermer High School, the proportion who plan to attend college is 0.64. In a random sample of 100 students from this population, the proportion who plan to attend college is 0.75. We would call the value 0.64 a P-value. z-score. parameter statistic significance level.A new drug for pain relief is being tested within a given palliative care population. The new drug is being compared to an already approved pain relief drug that is commonly used in providing palliative care to patients who experience chronic severe pain. Assume the patients are asked to rate the pain on a scale from 1 to 10, and the data presented below was obtained from a small study designed to compare the effectiveness of the two drugs. Set up and interpret the results of a Mann-Whitney U test with an alpha of .05. Pain Rating as Reported by Patients Old Drug 1 2 2 4 6 New Drug 1 2 2 3 7 Old Drug New Drug Total Sample (Ordered Smallest to Largest) Ranks Old Drug New Drug Old Drug New Drug 1 1 1 1 1.5 1.5 2 2 2 2 4.5 4.5 2 2 2 2 4.5 4.5 4 3 3 7 6 7 4 8 6…A new drug for pain relief is being tested within a given palliative care population. The new drug is being compared to an already approved pain relief drug that is commonly used in providing palliative care to patients who experience chronic severe pain. Assume the patients are asked to rate the pain on a scale from 1 to 10, and the data presented below was obtained from a small study designed to compare the effectiveness of the two drugs. Set up and interpret the results of a Mann-Whitney U test with an alpha of .05. Pain Rating as Reported by Patients Old Drug 1 3 3 4 6 New Drug 1 2 3 3 7
- A new drug for pain relief is being tested within a given palliative care population. The new drug is being compared to an already approved pain relief drug that is commonly used in providing palliative care to patients who experience chronic severe pain. Assume the patients are asked to rate the pain on a scale from 1 to 10, and the data presented below was obtained from a small study designed to compare the effectiveness of the two drugs. Set up and interpret the results of a Mann-Whitney U test with an alpha of .05. Pain Rating as Reported by PatientsOld Drug 1 2 2 4 6 New Drug 1 2 2 3 7Old Drug New Drug Total Sample(Ordered Smallest to Largest) RanksOld Drug New Drug Old Drug New DrugR1= R2= A) We reject H0 in favor of H1, which states the two populations are not equal at the alpha equals .05 level because the calculated U value of 12.5 is greater than the critical U value of 2.B) We reject H0 in favor of H1, which states the two populations are not equal at the alpha equals .05…A new drug for pain relief is being tested within a given palliative care population. The new drug is being compared to an already approved pain relief drug that is commonly used in providing palliative care to patients who experience chronic severe pain. Assume the patients are asked to rate the pain on a scale from 1 to 10, and the data presented below was obtained from a small study designed to compare the effectiveness of the two drugs. Set up and interpret the results of a Mann-Whitney U test with an alpha of .05. Pain Rating as Reported by Patients Old Drug 1 3 3 4 6 New Drug 1 2 3 3 7 Old Drug New Drug Total Sample (Ordered Smallest to Largest) Ranks Old Drug New Drug Old Drug New Drug…A new drug for pain relief is being tested within a given palliative care population. The new drug is being compared to an already approved pain relief drug that is commonly used in providing palliative care to patients who experience chronic severe pain. Assume the patients are asked to rate the pain on a scale from 1 to 10, and the data presented below was obtained from a small study designed to compare the effectiveness of the two drugs. Set up and interpret the results of a Mann-Whitney U test with an alpha of .05. Pain Rating as Reported by Patients Old Drug 1 3 3 4 6 New Drug 1 2 3 3 7 Old Drug New Drug Total Sample (Ordered Smallest to Largest) Ranks Old Drug New Drug Old Drug New Drug…
- A new drug for pain relief is being tested within a given palliative care population. The new drug is being compared to an already approved pain relief drug that is commonly used in providing palliative care to patients who experience chronic severe pain. Assume the patients are asked to rate the pain on a scale from 1 to 10, and the data presented below was obtained from a small study designed to compare the effectiveness of the two drugs. Set up and interpret the results of a Mann-Whitney U test with an alpha of .05. Pain Rating as Reported by Patients Old Drug 1 3 3 4 6 New Drug 1 2 3 3 7 A) We fail to reject H0, which states the two populations are equal at the alpha equals .05 level because the calculated Uvalue of 10.5 is greater than the critical U value of 2. B) We fail to reject H0, which states the two populations are equal at the alpha equals .05 level…The following table shows the results of a screening test hypothesized to detect persons at risk for side effects of a new cosmetic surgery. Compute the specificity of the test. Side effects present Side effects absent Screen positive 12 6 Screen negative 85 204An experiment was carried out to compares the time (in hours) it takes an engine to run on five (5) liters of petrol. Three makes of engine of the same capacity and running at the same speed were used in the experiment. The resulting data is given in the table below. ENGINE MAKE 12.5 11.5 17.5 13.0 12.3 18.0 12.4 13.0 17.3 13.1 13.2 18.2 What is the experimental design? Which are the treatments? Carry out the appropriate analysis and test the null hypothesis at 5% level of significance. Obtain the 95% confidence interval for engine make C.